how do you solve this system of linear equation by substitution

x-3y=-12
y=2x+9

Answers

Answer 1
Finding x:
If y=2x+9, substitute y into the equation x-3y=-12.
You will get:  x-3(2x+9)=-12
Now, distribute:  x-6x-27=-12
Add like terms:  -5x-27=-12
Add 27 to both sides:  -5x=15
Divide both sides by -5:  x=-3

Now, substitute this value of x into the equation to find y:  y=2(-3)+9
Multiply:  y=-6+9
Add:  y=3

Here is the solution:  (x,y)=(-3,3)

Hope this explanation helped!





Related Questions

Help a sphere has a radius of 8ft if the radius is doubled what is the effect on volume

Answers

If the radius of the sphere is doubled, the volume would quadruple. Think of the sphere as a cube instead and if you were to double the sides, the area would be 4xs bigger. Hope this helps! :)

A mosaic is made by having 1 cm square tiles glued onto a photograph. the photograph is a 6 cm by 8 cm rectangular photo. It is enlarged by a scale factor of 1.5. how many tiles are needed to cover the enlarged photo

Answers

A scale factor is the ratio of two similar geometric figures of their corresponding sides. The scale factor is calculated by locating the corresponding sides on each figure. Enlargement of a figure would have a scale factor that is greater than 1 which is evident for the problem above. To determine how many tiles would be needed to cover the enlarged photo, we need to know the new dimension of the photo. We do as follows:

Old photo = 6 cm x 8 cm
New photo = 6 cm x 1.5 x 8 cm x 1.5
                  = 9 cm x 12 cm

Number of tiles = Area of photo / Area of tiles
             Area of photo = 9 x 12 = 108 cm^2
             Area of tiles = 1 cm x 1 cm = 1 cm^2

Number of tiles = 108 cm^2 / 1 cm^2 = 108 tiles

The record ski jump for women is 110 meters. What is this length in feet?

Answers

110 meters converted to feet is: 360ft

Answer:

The record ski jump for women is 360.89 feet.

Step-by-step explanation:

The record ski jump for women is 110 meters.

Record ski jump = 110 m

We need to find what is this length in feet.

We have the conversion 1 m = 3.28084 ft

Using the above conversion

We will get

             1 m = 3.28084 ft  

             110 m = 110 x 3.28084 = 360.89 ft

The record ski jump for women is 360.89 feet.

which function is equivalent to the inverse of y=sec(x)
a. y=cot^-1(x)
b. y=cos^-1(1/x)
c. y=csc^-1(x)
d. y=sin^-1(1/x)

Answers

From the identity:

[tex]sec(x)= \frac{1}{cos(x)} [/tex]


[tex]f(x)=sec(x)= \frac{1}{cos(x)} [/tex]

the inverse of f is g such that f(g(x))=x,

we must find g(x), such that [tex] \frac{1}{cos[g(x)]}=x [/tex]

thus, [tex]cos[g(x)]= \frac{1}{x} [/tex]

[tex]g(x)=cos^{-1} (\frac{1}{x}) [/tex]


Answer: b. g(x)=cos^-1(1/x)   

Answer: B) csc^-1(x)

Step-by-step explanation: EDGE 2021

Larry's dining room table measures five feet in diameter. what scale diameter will he use if the scale he is using is 1 inch = 2 feet?

Answers

U can set up a proportion for this question if u want.
1/2 = x/5
2x = 5
X = 5/2

2.5 inches would measure 5 feet according to the scale

Answer: 2.5 inches.

Step-by-step explanation:

The given statement : Larry's dining room table measures five feet in diameter.

i.e. We are given that the diameter of Larry's dining room table = 5 feet

The scale used by him 1 inch =2 feet

i.e. [tex]\text{1 feet =}\dfrac{1}{2}\text{ inch}[/tex]

Now, [tex]\text{5 feet =}5\times\dfrac{1}{2}\text{ inches}=2.5\text{ inches}[/tex]

Therefore, the scale diameter he will use = 2.5 inches.

The excel function ________ would be used to find the lowest score on a series of student test scores. min median sum dmin

Answers

MIN is minimum function if you highlight a row or column or a range of numbers. 
Final answer:

The Excel function you should use to find the lowest score in a series of test scores is the MIN function. It determines the smallest number in a set of values.

Explanation:

The Excel function that should be used to find the lowest score on a series of student test scores is the MIN function. This function allows you to determine the smallest number in a set of values. For instance, if you have the scores in cells A1 to A10, you would write the formula as =MIN(A1:A10).

It's important to note that the other options provided, such as median, sum, and dmin, would not accurately find the lowest score. The median would find the middle score, sum would add all the scores together, and dmin is a database function that extracts the smallest number from a selected database column based on the specified conditions.

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As a salesperson at Scrapbooks and Treasures, Alysse receives a monthly base pay plus commision on all that she sells. If she sells $400 worth of merchandise in one month, she is paid $388. If she sells $1,000, she is paid $520. Find Alysse's salary when she sells $3,300 worth of merchandise.

Answers

In order to find the answer to this, you need to be able to solve for 2 things: what she makes as a base salary and what she makes percentage-wise on her commission.  You have information for 2 different equations that will help you here.  Set them up as equations, using x and her base salary and y as the percentage of her sales:
[tex]388=x+(y%*400)[/tex] where 388 is what she earns after her base salary, x, is paid and her commission of 400.  y is the percent of the commission that she earns.  As you can see, we have 2 unknowns, which COULD be a problem.  But let's move on first before we freak out.
The next equation involves the other bit of info: that she earns 520 after her base salary of x and her commission of 1000 based on whatever the percentage of her sales is, which is y.  That equation looks like this:
[tex]520=x+(y%*1000)[/tex]
Because her base salary is constant, the x's are the same number in both equations.  So we can solve each for x:
[tex]x=-388+400y[/tex]
[tex]x=-520+1000y[/tex]
Now that these are both solved for x, and x is the exact same number, we can set those 2 equations equal to each other by the transitive property of equality:
=388+400y= -520+1000y
Solving for y gives you:
132=600y and
[tex] \frac{132}{600} =y[/tex]
Because this is a percentage, we will multiply the decimal we get by 100 to find that the percentage she earns on a sale is 22%.  Now that we have that percentage, we can find her base salary.  Do that like this:
Use one of your equations to solve for x:
388=x+[(.22)(400)]
388=x+88 and x = 300.  That's her base salary.  Now use that base salary in an equation to find out her monthly pay after she sells $3,300 worth of merchandise in a month:
x = 300 + [(.22)(3300)]
x = 300 + 726
x = $1,026
That's how much she makes after her base salary of $300 plus her earning off selling $3,300 worth of merchandise at 22% commission.

Answer:

Step-by-step explanation:

In order to solve this we just have to create a system of equations, because we have to unknown values, for the base salary we are going to use X and for the comission we will use Y, now we know that when she sold $400 in merchandise she earned $388 and and when she sold $100 se got paid $520 both equations would look like this:

[tex]x+400y=388\\x+1000y=520][/tex]

Now we can solve them by elimination, multiplying one function by -1.

[tex](-1)(x+400y=388)= -x-400y=-388\\x+1000y=388\\1000y-400y=132\\600y=388\\y=\frac{132}{600} \\y=0.22=22%[/tex]

Now we know that the percentage that she earns is 22% of the merchandise she sells.

Now to know how much does she makes on her base pay we just put the value into one of the functions:

[tex]x+1000y=520\\x+1000(.22)=520\\x+220=520\\x=300[/tex]

So her base pay is $300.

To calculate how much she will earn when she sells $3,300 in merchandise we just put that value into the formula:

[tex]x+3300y=\\300+3300(.22)\\300+726=1026[/tex]

So when she sells 3300 she will make 1026 total.

(05.06)Bentley had $40 in birthday money in her piggy bank. She spent $10 on new flip-flops, then got $20 for her allowance and did not spend any of that money for 1 week. Finally, she spent $15 on new sunglasses.

Which part of the scenario is best represented by a linear increasing interval?

Bentley has $40 in her piggy bank.
Bentley spent $10 on new flip flops.
Bentley got $20 for her allowance.
Bentley spent $15 on sunglasses.

Answers

linear increase would be something added to an equation.

 she started with 40,

she spent 10 on flip flops and also spent 15 of sunglasses those are decreases

she added 20 for allowance which is an increase and we can assume she gets the same amount of allowance every week

 so that would be the linear increase

Bentley had $40 in birthday money in her piggy bank. Bentley got $20 for her allowance which is represented by a linear increasing interval.

What is the unitary method?

The unitary method is a method for solving a problem by the first value of a single unit and then finding the value by multiplying the single value.

Bentley had $40 in birthday money in her piggy bank.

She spent $10 on new flip-flops, then got $20 for her allowance and did not spend any of that money for 1 week.

Finally, she spent $15 on new sunglasses.

linear increase would be something added to an equation.

she started with $40 in her piggy bank.

She spent 10 on flip-flops and also spent 15 on sunglasses. This show decreases.

she added 20 for the allowance which is an increase and we can assume she gets the same amount of allowance every week.

So, that would be the linear increase.

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A student claims that a figure has rotational symmetry and that the angle of rotational symmetry is 360 degrees. Critique the student's statement.

Answers

Remember rotational symmetry means if you turn it you end up with the same figure you started with. This happens with regular polygons since each angle is congruent. To find the angle of rotation you divide 360 by the number of angles. So if you rotated 360 degrees, that means 360/360=1. Your figure only had one angle, so it can't even be a polynomial! Also, every figure in the world will look exactly like it started if rotated 360 degrees, so this would not be logical. 

The x-intercept of the line x = 3.5 is . The y-intercept of the line y = -6.5 is . Enter your answer as an ordered pair such as (1, 1) or (-2, 2).

Answers

The x-intercept of the line x = 3.5 means that when y=0, and x=3.5, so the order pair for this is (3.5,0) or (3 1/2,0)
Next, The y-intercept of the line y = -6.5 means that when x=0, and y=-6.5, so the order pair for this is (0,-6.5) or (0,-6 1/2). As a result, The x-intercept of the line x = 3.5 is (3.5,0) or (3 1/2,0) . The y-intercept of the line y = -6.5 is (0,-6.5) or (0,-6 1/2). Hope it help!

if acircle is inscribed in a hexagon, which of the following must be true ? Check all that apply.

A. The hexagon is circumscribed about the circle.
B. Each vertex of the hexagon lies inside the circle.
C. The circle is congruent to the hexagon.
D. Each vertex of the hexagon lies outside the circle.
E. The circle is tangent to each side of the hexagon.

Answers

A. The hexagon is circumscribed about the circle .
D. Each vertex of the hexagon lies outside the circle .
E. The circle is tangent to each side of the hexagon .

Answer:  A. The hexagon is circumscribed about the circle.

D. Each vertex of the hexagon lies outside the circle.

E. The circle is tangent to each side of the hexagon.


Step-by-step explanation:

Given: A circle is inscribed in a hexagon.

Then the hexagon is circumscribed about the circle.

Each vertex of hexagon lies outside the circle.

As each side of hexagon is just attached to the circle not passing through the circle, thus the circle is tangent to each side of the hexagon.

Since circle is a closed curve and hexagon is regular polygon with 6 sides, they cannot be congruent because they have different shapes.

The area of a rectangle is 28 ft2 , and the length of the rectangle is 1 ft more than twice the width. find the dimensions of the rectangle.

Answers

W=x
L=2x+1
Area=(2x+1)x=28
2x²+x=28
2x²+x-28=0

(2x-7)(x+4)=0
x=3.5, -4. (3.5 makes more sense)
2x+1=8
area = 28 ft²
width = 3.5 feet | length = 8 feet.

The length is 8feet and the width of the rectangle is 3.5feet

Let the width of the rectangle be represented by w

Let the length of the rectangle be represented by = 2w + 1

Therefore, based on the information given, the equation to solve the question will be:

w(2w + 1) = 28

2w² + w = 28

2w² + w - 28 = 0

2w² + 8w - 7w - 28 = 0

2w(w + 4) - 7(w + 4) = 0

2w - 7 = 0

2w = 0 + 7

2w = 7

w = 7/2

w = 3.5

The width is 3.5 feet

The length will be:

= 2w + 1

= 2(3.5) + 1

= 7 + 1

= 8

The length is 8feet and the width is 3.5feet

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Bobby knows that the perimeter of the original rectangular is 120 meters he also knows that the perimeter of the reduced rectangular is 30 meters and the reduced length is 9 meters

Answers

In my opinion the answer is 36 meters

Answer:36meters

Step-by-step explanation:

The screen on Lawrence's new phone is 3.15 centimeters long.What mixed number represent the lenght of the phone screen?

Answers

A mixed number is written in a form of [tex]a \frac{b}{c} [/tex], where 'a' is a whole number.

One example of mixed number is [tex]3 \frac{1}{4} [/tex], read as 'three and one quarter'. As decimal fraction, [tex]3 \frac{1}{4} [/tex] equals to 3.25

We are given the value of 3.15 and to change this into a mixed number, first note the whole number, which is 3.

We then change the decimal value 0.15 into a fraction and it is [tex] \frac{15}{100}= \frac{3}{20} [/tex] 

Hence, 3.15 = [tex]3 \frac{3}{20} [/tex] 

Find the 39th term of the arithmetic sequence that starts with 4 and has a common difference of 6.

A. 232

B. 226

C. 238

D. None of these

Answers

Any arithmetic sequence can be expressed as:

a(n)=a+d(n-1), a=initial term, d=common difference, n=term number.

We are told that a=4 and d=6 so we have:

a(n)=4+6(n-1), so the 39th term is:

a(39)=4+6(38)

a(39)=4+228

a(39)=232

find the center of the circle that can be circumscribed about triangle EFG, E(6,4) F(6,2) and G(10,2)

Answers

Final answer:

The center of the circumscribed circle about triangle EFG with given vertices is found by calculating the perpendicular bisectors of the triangle's sides and locating their intersection point, which is the center (8,3).

Explanation:

To find the center of the circumscribed circle about triangle EFG with vertices E(6,4), F(6,2), and G(10,2), we need to determine the perpendicular bisectors of at least two sides of the triangle and then find their intersection point, which will be the center of the circumscribed circle.

First, find the midpoint of side EF, which has the same x-coordinate (since E and F have the same x-coordinate), so the midpoint is (6,3).Next, we need the equation of the perpendicular bisector of EF. Since EF is vertical, its perpendicular bisector is a horizontal line that passes through the midpoint, hence the equation is y = 3.Then, find the midpoint of side FG. As the endpoints have the same y-coordinate, the midpoint will have that y-coordinate (2) and the x-coordinate will be the average of the x-coordinates of F and G, which is (6+10)/2 = 8. So, the midpoint of FG is (8,2).The slope of side FG is 0 (since it's horizontal), so the slope of its perpendicular bisector is undefined, meaning it's a vertical line. Consequently, the equation of this perpendicular bisector is x = 8.Last, by solving the system of equations formed by the two perpendicular bisectors x = 8 and y = 3, we find the intersection point, which is the center of the circumscribed circle: (8,3).

What is the slope of a line that is perpendicular to the line v= 3/4x-6?

A. 3/4
B. -4/3
C. -3/4
D. 1/6

Answers

A perpendicular slope is equal to the negative reciprocal of the given slope, which is 3/4.

The reciprocal of 3/4 is 4/3. The negative of that is -4/3.

Final answer: B

The slope of line which is given to be perpendicular to the line represented by equation "v = (3/4)x - 6" is : (b) -4/3.

To determine the slope of a line that is perpendicular to the given line v = (3/4)x - 6, we use the property that perpendicular lines have slopes that are "negative-reciprocals" of each other.

The slope of the given line is 3/4. To find the slope of the perpendicular line, we take the negative reciprocal of 3/4.

The negative reciprocal of 3/4 is -4/3. So, the slope of the line that is perpendicular to the given-line v = (3/4)x - 6 is -4/3.

Therefore, the correct answer is (b) -4/3.

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Help please. Find the value of the variable. If your answer is not an integer, leave it in simplest radical form.

A.5√2 /2

B.5√3

C.5√2

D.5√3 /2



Answers

Answer:  The value of the variable is [tex]x=\dfrac{5\sqrt2}{2}.[/tex]

Step-by-step explanation:  We are given to find the value of the variable 'x' in the figure.

We can see that the figure is a right-angled triangle with the length of the hypotenuse as follows:

h = 5 units.

Now, with respect to the angle of measure 45°, the length of the perpendicular is x units.

That is, p = x units.

From relations between trigonometric ratios, we have

[tex]\sin 45^\circ=\dfrac{\textup{perpendicular}}{\textup{hypotenuse}}\\\\\\\Rightarrow \dfrac{1}{\sqrt2}=\dfrac{p}{h}\\\\\\\Rightarrow \dfrac{1}{\sqrt2}=\dfrac{x}{5}\\\\\\\Rightarrow x=\dfrac{5}{\sqrt2}\\\\\\\Rightarrow x=\dfrac{5\sqrt2}{(\sqrt2)^2}\\\\\\\Rightarrow x=\dfrac{5\sqrt2}{2}.[/tex]

Thus, the value of the variable is [tex]x=\dfrac{5\sqrt2}{2}.[/tex]

Solve 2(x-1) = 3x+4

Answers

2(x - 1) = 3x + 4
2x - 2 = 3x + 4
x = -6

What is the probability that the student will have score between 71 and 80

Answers

The answer to this problem is B 1/3

Find y' if x = tan(y)

Answers

Use the chain rule:

[tex]x=\tan y[/tex]
[tex]\dfrac{\mathrm d}{\mathrm dx}x=\dfrac{\mathrm d}{\mathrm dx}\tan y[/tex]
[tex]1=\sec^2y\dfrac{\mathrm dy}{\mathrm dx}[/tex]
[tex]1=\sec^2y\,y'[/tex]
[tex]y'=\dfrac1{\sec^2y}=\cos^2y[/tex]

Furthermore, if you restrict the domain of [tex]y[/tex], we could write

[tex]x=\tan y\iff \tan^{-1}x=y[/tex]

and so we could also have

[tex]y'=\cos^2(\tan^{-1}x)=\left(\dfrac1{\sqrt{x^2+1}}\right)^2=\dfrac1{x^2+1}[/tex]

find the value of x.

Answers

To find the value of X, simply know that for this parallelogram, the angles on each end that are diagonal with respect to each other are the same. And knowing that the angles in a parallelogram add up to equal 360 degrees. Simply make an algebraic expression equal to the value of 360 and then solve for x.

X + X + (X - 26) + (X - 26) = 360
2X + X - 26 + X - 26 = 360
4X - 52 = 360
4x = 412
X = 103.

The value for X, I believe would be 103 degrees. You can verify this by plugging in the value into both expressions, X and X-26 and see that if adding all the expressions together does it equal 360 degrees.

What is the midpoint of (-3,-7) and (9,8)

Answers

Hope this will help you. It is a little hard to explain.

Factor y2 + 10z - 10y - yz.

Answers

Hey!

First, let's write the problem.
[tex]y^2+10z-10y-yz[/tex]
First, we have to factor the y from [tex]y^2-10y[/tex], so we would be left with,
[tex]y\left(y-10\right)[/tex]
Next, we factor the [tex]-z[/tex] from [tex]10z-yz[/tex]. This would leave us with,
[tex]=y\left(y-10\right)-z\left(y-10\right)[/tex]
The common term is [tex]\left(y-10\right)[/tex], so let's factor it out.
[tex]=\left(y-10\right)\left(y-z\right)[/tex]
That would be our final answer.

Thanks!
-TetraFish
Factor by grouping.

GCF of y^2 and -yz
GCF of 10z and -10y

y(y-z)+10(z-y)

Now, (z-y) is the opposite of (y-z), so turn the +10 into -10 and change sign inside parenthesis.

y(y-z) - 10 (y-z)

(y-10)(y-z)

two points are collinear

Answers

Collinear is when two points are on the same plane. For example: in this picture A B C and D are collinear. Two points can still be collinear if they don’t have a line in between them too, just as long as you can draw a straight line between them they are collinear.

Answer:

1. B

2. C  

3. B

4. C  

5. A

6. A

7. C  

8. A

9. D

10. C  

11. B

12. B

A ship traveled for 4 hours heading west and for 5 hours heading north. If the total distance traveled was 119 miles, and the ship traveled 5 miles per hour faster west, at what speed was the ship traveling west

Answers

let speed that ship travelled west be x mph

then distance travelled west =  time * speed =  4x

speed going North was x - 5 mph   and distance = 5(x - 5)

so we have
4x + 5x -25 = 119


9x = 119+25  = 144
x = 144/9 =  16 mph <------ answer


A building is 60 ft tall and another is 80 ft tall. A model of the 60 ft building is made at 1 ft. tall. How tall is the model of the 80 ft tall building?

Answers

1 foot = 60 feet

80/60 = 1.333

 80 foot building is made 1.33 feet tall (16 inches, 1 foot 4 inches)

The altitude to the hypotenuse of a right triangle divides the hypotenuse into two segments measuring 11 centimeters and 5 centimeters. to the nearest tenth, what is the length of the shorter leg of the triangle?

Answers

a^2 = x^2 - 5^2     where a = altitude, x=shorter leg and y=longer leg.

a^2 = y^2 + 11^2

x^2  - 5^2 = y^2 - 11^2.......... (1)

Also consider the  whole triangle:

x^2 + y^2 = 16^2..........(2)

x^2 - y^2 =   -96  .........(3)                 (from  equation (1))


adding   2 x^2 =   256 + -96 =  160

x^2 = 80 

x = sqrt80

   =  8.94 to nearest hundredth

A swimming pool is 15 by 30 feet and a consistent 5 feet deep. you are painting the walls and floor of the pool. if a gallon can of paint covers 250 square feet, how many gallon cans would you need to buy

Answers

the bottom of the pool is 15 x 30 = 450 sq feet.

 you the have 2 walls that are 30 x 5 = 150 x 2 = 300 square feet

 then 2 walls that are 15 x 5 = 75 x 2 = 150 square feet

 for a total of 450 +300 +150 = 900 square feet

 1 can covers 250 sq ft

so 900/250 = 3.6

 so you would need 4 cans of paint

The temperature of a point $(x,y)$ in the plane is given by the expression $x^2 + y^2 - 4x + 2y$. what is the temperature of the coldest point in the plane?

Answers

[tex] x^{2} + y^{2}-4x+2y [/tex]

can be written as follows:

[tex] x^{2} -4x+ y^{2}+2y[/tex]

[tex](x^{2} -4x+4)-4+ (y^{2}+2y+1)-1[/tex]

[tex] (x-2)^{2}+(y+1)^{2} -5[/tex]

since [tex](x-2)^{2}[/tex] and [tex](y+1)^{2}[/tex] are always positive, except for x=2 and y=-1, when they become 0,

the minimum value of this expression is when x=2, and y=-1, that is -5



Answer: -5
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