How to solve equations

Answers

Answer 1
Here are some things you should know when solving algebraic equations.

If you add an expression to both sides of an equation, the resulting equation will have the same solution set as the original equation. In other words, they will be equivalent. This is true for all operations. As long both sides are treated the same, the equation will stay balanced.

You will also need to know how to combine like terms. But what are like terms to begin with? Like terms are defined as two terms having the same variable(s) (or lack thereof) and are raised to the same power. In mathematics, something raised to the first power stays the same. So, 5x and 10x are like terms because they both have the same variable and are raised to the first power. You don’t see the exponents because it doesn’t change the value of the terms.

To combine like terms, simplify add the coefficients and keep the common variable(s) and exponent.

The distributive property is another important rule you will need to understand.

The distributive property is used mostly for simplifying parentheses in expressions/equations. 

For example, how would you get rid of the parentheses here?

6(x + 1)

If there wasn’t an unknown in between the parentheses, you could just add then multiply. That is what the distributive property solves.
The distributive property states that a(b + c) = ab + ac
So, now we can simplify our expression.

6(x + 1) = 6x + 6

Related Questions

Find the coordinates of the midpoint of ab with endpoints a(-10,3) and b(2,-2) worksheet answers

Answers

-10+2/2 and 3-2/2
(-4;1/2)

Which statement is true about the line passing through points A and B?


A. The line has a finite length that can be measured.

B. There is only one way to name the line.

C. The line has infinitely many points.

D. There are only two points on the entire line.

Answers

I want to say it's D because if we're talking about points A and B, the line would be line AB or BA, and, as the question states, there are 2 points.

A moving company charges a $2,000 fee plus $100 per hour. Another moving company charges an $1,800 fee plus $150 per hour. How long is a job for which the two companies' costs are the same?

Answers

The costs of two moving companies are the same for a job that lasts 4 hours.

To find out how long a job must last for the two companies' costs to be the same, we need to set up an equation where both company costs are equal and solve for the time variable, which I will denote as 't' hours.

The first moving company's cost can be represented as:$2,000 + $100 x t.

The second moving company's cost can be represented as: $1,800 + $150 x t.

To find the time when both costs are the same, we set the two expressions equal to each other:

$2,000 + $100t = $1,800 + $150t

Now, we need to solve for 't' by subtracting $100t from both sides and subtracting $1,800 from both sides:

$200 = $50t

Divide both sides by $50 to isolate 't':

t = 4 hours

So, the two companies would have the same cost for a 4-hour job.

What is the area of a triangle whose vertices are
R(−4, 2),S(1, 2), and T(−5, −4)?
 
Enter your answer in the box

Answers

ANSWER

15 square units.

EXPLANATION

This triangle has one of its height(altitudes) falling outside the triangle.

We determine the base using absolute value method. This is because the coordinates of [tex]R(-4,2)[/tex] and [tex]S(1,2)[/tex] tell us that this line is horizontal. The y-values are constant.

Therefore [tex]|RS|=|1--4|[/tex]

[tex]\Rightarrow |RS|=|1+4|[/tex]

[tex]\Rightarrow |RS|=|5|[/tex]

[tex]\Rightarrow |RS|=5[/tex]

Also

The triangle is bounded between [tex]y=2[/tex] and [tex]y=-4[/tex].

Therefore the vertical height of interest,

[tex]|RT|=|-4-2|[/tex]

[tex]|RT|=|-6|[/tex]

[tex]|RT|=6[/tex]

We can now find the area using the formula

[tex]Area=\frac{1}{2}base\times height[/tex]

[tex]Area=\frac{1}{2}\times6 \times 5[/tex]

[tex]Area=3 \times 5[/tex]

[tex]Area=15[/tex] square units

Can someone help me with 16 and 20? If you’re supposed to write a contrapositive and inverse, but the word not is already in the statement, what do you do?

Answers

Since 2 'not's cancel out, 16's contrapositive is 'If the light will go on, then the fuse has not blown'. In addition, the inverse would be 'If the fuse has not blown, then the light will go on'. I challenge you to do 20 using this information!

If a system of linear equations has the unique solution (2, −3), then its graph consists of what?

parallel lines
lines that intersect at a single point
identical lines
a y-intercept at −3

Answers

Answer: B - lines that intersect at a single point

Answer:

Answer: B - lines that intersect at a single point

Step-by-step explanation:

glad i helped

what is the measure of <DCF

Answers

129 degrees you just add DCE and ECF together

Answer:

The measure of angle DCF is 129 degrees.

Step-by-step explanation:

Angle DCF is the sum of angle DCE plus angle ECF.

This is because, DCF is the main angle and DCE and ECF are its two parts.

Hence, the measure of angle DCF will be = [tex]75+54=129[/tex] degrees.

The answer is :

The measure of angle DCF is 129 degrees.

What are the solutions to x2 8x 7 = 0? x = –8 and x = –7 x = –7 and x = –1 x = 1 and x = 7 x = 7 and x = 8?

Answers

We want to solve
x² + 8x + 7 = 0

Factorize the left side.
x² + 8x + 7 = (x + 1)(x + 7)

Therefore
(x + 1)(x + 7) = 0
When (x + 1) = 0, obtain x = -1.
When (x + 7) = 0, obtain x = -7.

The solutions are x = -1 and x = -7

Answer: x = -7  and x = -1.


The correct solutions to the given equation are x = 1 and x = 7.

The solutions to the equation x² - 8x + 7 = 0 are x = 1 and x = 7.

To find these solutions, we can factor the quadratic equation by finding two numbers that multiply to 7 (the constant term) and add up to -8 (the coefficient of the x term).

Therefore, the correct solutions to the given equation are x = 1 and x = 7.

Write each number as the product of its prime factors
1.) 76
2.) 35
3.)36
4.) 150
5.)180
6.) 520
please help i have 30 mins to get these answered!! :(

Answers

1) 2x2x3
2) 5x7
3) 2x2x3x3
4) 2x3x5x5
5) 2x2x3x3x5
6) 2x2x2x5x13

If a number is rational then it must be a whole number true or false

Answers

False, because rational numbers are mostly fractions which isn't exactly a whole number

There are five position players on a starting basketball team: 2 guards, 2 forwards, 1 canter. Write a ratio in simplest from to express each relationship

Answers

Final answer:

The ratios for the basketball positions in simplest form are guards as 2:5, forwards as 2:5, and the center as 1:5.

Explanation:

The question asks to write ratios for the positions on a basketball team and then to express those ratios in simplest form. There are 5 position players on a starting basketball team, consisting of 2 guards, 2 forwards, and 1 center. To express the relationships between each position, we can write the ratios of guards to the total number of players, forwards to the total number of players, and the center to the total number of players.

The ratio of guards to the total number of players is 2 guards to 5 total players, which simplifies to 2:5.

The ratio of forwards to the total number of players is 2 forwards to 5 total players, simplifying to 2:5.

Lastly, the ratio of the center to the total number of players is 1 center to 5 total players, simplified as 1:5.

5/16t=-9

Plz help me ASAP and show all of the steps that you did! PLEASE HELP!!! :) 10 POINTS!!!!!

Answers

I'm going to assume that the equation is [tex]\frac{5}{16}t = -9[/tex] where the 't' is not in the denominator

If that assumption is correct, then we do two things to solve for t. First, we multiply both sides by 16. This undoes the division of 16 on the left side

[tex]\frac{5}{16}t = -9[/tex]

[tex]16*\frac{5}{16}t = 16*(-9)[/tex]

[tex]5t = -144[/tex]

-------------------------------

Then we divide both sides by 5 to undo the multiplication of 5 (note: 5t means 5*t or "5 times t")

[tex]5t = -144[/tex]

[tex]\frac{5t}{5} = \frac{-144}{5}[/tex]

[tex]t = -\frac{144}{5}[/tex]

-------------------------------

So here's what all the steps look like:

[tex]\frac{5}{16}t = -9[/tex]

[tex]16*\frac{5}{16}t = 16*(-9)[/tex]

[tex]5t = -144[/tex]

[tex]\frac{5t}{5} = \frac{-144}{5}[/tex]

[tex]t = -\frac{144}{5}[/tex]

note: -144/5 converts to the decimal value of -28.8 so t = -144/5 is the same as t = -28.8

What is the perimeter of a square with an area of 144 square inches?

Answers

Hi!

Since we know a square has sides of equal length, and to find the area of a square you square one of the side lengths, find the square root of 144.

The square root of 144 is 12.

So the means each side length is 12.

A perimeter is the distance around the square, or all of the side lengths added together.

4 sides on a square, each length is 12...
12 x 4 = 48

The perimeter is 48

Hope this helps! :)

The length of a rectangle is twice its width. if the perimeter of the rectangle is 54 ft , find its length and width.

Answers

Let w be the width.

2(2w) + 2w = 54.

4w+2w = 54
6w=54.
w=9
So length equals twice that...I think you can solve that on your own. xD

what would 3/4 - 3/4 be?

Answers

Anything subtracted by itself is 0

So, the answer is 0.

Hope this helped!
3/4 minus 3/4 would be 0. hope you can figure it out on your own now

which number belongs to the solution set of the equation below? 9x=114
A.14
B.16
C.12
D.18

Answers

its C.

You divide 114 / 9 and get your answer
Hi there!

9x = 114
Divide both sides by 9
9x/9 = 114/9
x = 38/3
In decimal it is x = 12.666667

So, C is the correct answer!
I hope I helped!

How to write an equation with an undefined slope?

Answers

hello : 
an equation with an undefined slope is : x = a
parallal a : y axis

Determine whether the quantitative variable is discrete or continuous. number of lightning strikes in a city in one year'

Answers

The number of lightning strikes will be a whole number

Therefore it is a discrete variable
That quantitative variable is discrete because you only get one answer when your figuring out how many lightning strikes in a city in one year.

what is the value of x

Answers

6^2 + 8^2 = x^2

36 + 64 = 100

sqrt(100) = 10

 x = 10

To solve this, we need to use Pythagorean Theorem. This is a formula that says a²+b²=c². A and B represent the legs of the triangle while c is the hypotenuse. We can simply substitute in our values for a and b and solve.

a²+b²=c²
8²+6²=c²
64+36=c²
100=c²
√100=√c²
10=c

Using the math above, we can see that c (x) equals 10.

What is the solution to the following system of linear equations?

{4x - y = -6
{x - 2y = -5

Please explain how you solved!

Answers

Final answer:

The solution to the system of linear equations is x = -1, y = 2

Explanation:

To solve the system of linear equations:
4x - y = -6
x - 2y = -5
We can use the method of substitution or elimination to find the solution.
Let's use the elimination method. We can multiply the second equation by 4 to make the coefficients of x in both equations the same.
4(x - 2y) = 4(-5)
4x - 8y = -20
Now, we can subtract the second equation from the first equation to eliminate x.
(4x - y) - (4x - 8y) = (-6) - (-20)
-y + 8y = 14
7y = 14
y = 2
Substituting y = 2 back into the first equation:
4x - 2 = -6
4x = -4
x = -1
The solution to the system of linear equations is x = -1, y = 2

Find a cubic function with the given zeros. Square root of two., - Square root of two., -2 A. f(x) = x^3 + 2x^2 - 2x + 4 B. f(x) = x^3 + 2x^2 + 2x - 4 C. f(x) = x^3 - 2x^2 - 2x - 4 D. f(x) = x^3 + 2x^2 - 2x - 4

Answers

Hello,

Answer D

[tex](x- \sqrt{2} )*(x+ \sqrt{2} )*(x+2)\\\\ =(x^2-2)(x+2)\\\\ =x^3+2x^2-2x-4\\\\ [/tex]

Marks canoes rents for $20 plus $35 per hour you do not want to spend more than $1.50.for how many hours can you afford to rent the canoe

Answers

You can get 3 hours in because $150-$20= $130
$130/35=3.7 hours but since he can’t spend over that amount it would be 3 hours
3 hours will be your answer.
Have a blessed day/night.

Find the sum of 2x 2 + 3x - 4, 8 - 3x, and -5x 2 + 2

Answers

2x²+3x-4+8-3x+(-5)x²+2
(2x² -5x²)+(3x-3x)+(-4+8+2)
-3x+6

Answer:

The answer is -3x^2+6

What is the multiplicative rate of change of the exponential function shown on the graph?

A) 2/9
B) 1
C) 4
D) 9/2

Answers

Answer:

Option: D is correct.

9/2

Step-by-step explanation:

We have to find the multiplicative rate of change of the exponential function shown on the graph.

We know that a general exponential function is given as:

[tex]y=ab^x[/tex]

where b is the multiplicative rate of change.

Now when x=0 we have y=1.

i.e. 1=a

Hence, a=1

and y=b^x

Also,

the graph passes through (1,9/2)

Now when x=1 we have y=9/2

i.e.

9/2=b

Hence, the multiplicative rate of change is:

9/2

The correct answer is A) 2/9. The multiplicative rate of change of the exponential function shown on the graph is A) 2/9.

To determine the multiplicative rate of change of an exponential function from its graph, we need to identify two points on the graph that are one unit apart horizontally (i.e., one unit apart in the x-direction). The multiplicative rate of change is the ratio of the function values (y-values) of these two points.

Let's assume we have two points, (x, y) and (x+1, y'), where y and y' are the corresponding y-values of the exponential function at these x-values. The multiplicative rate of change, r, is given by:

[tex]\[ r = \frac{y'}{y} \][/tex]

From the graph, we can identify two such points. For example, if the function passes through the y-axis at (0, 1) and then at (1, 2/9), we can calculate the multiplicative rate of change as follows:

[tex]\[ r = \frac{2/9}{1} = \frac{2}{9} \][/tex]

This is the multiplicative rate of change of the exponential function. It indicates that for every unit increase in x, the y-value is multiplied by 2/9.

Therefore, the multiplicative rate of change of the exponential function shown on the graph is A) 2/9.

Kristen bought 2 candy bars for $1.29 each and a soda for$1.99. She had to pay $0.38 in tax. How much was her bill?

Answers

Answer:

$4.95

Step-by-step explanation:

1.29 * 2 = 2.58 + 1.99 = 4.57

4.57 + .38 = 4.95

The number of hours per week that the television is turned on is determined for each family in a sample. the mean of the data is 3030 hours and the median is 26.226.2 hours. twenty-four of the families in the sample turned on the television for 1515 hours or less for the week. the 11th11th percentile of the data is 1515 hours. step 2 of 5 : approximately how many families are in the sample? round your answer to the nearest integer.

Answers

Go to papa math,tiger algebra,picture math!!!!!!

what is the algebraic expression for the following word phrase: the quotient of 6 and the sum of 5 and y? A: 6/5-y B: 6/5+y C:6(5+y) D: 6/5 + 6y

Answers

that means that 6 is divided by (5+y)

Its  B  though i would have wriiten it as 6/(5+y)  to avoid ambiguity

The algebraic expression for the word phrase is;

⇒ 6/5+y

Option B is true.

Here,

The word phrase is;

''The quotient of 6 and the sum of 5 and y''.

We have to find the algebraic expression.

What is Mathematical expression?

The combination of numbers and variables by using operations addition, subtraction, multiplication and division is called Mathematical expression.

Now,

The word phrase is;

''The quotient of 6 and the sum of 5 and y''.

Quotient means fraction and sum of 5 and y is 5 + y.

Hence, The algebraic expression is;

⇒ 6 / 5+y

Therefore, The algebraic expression for the word phrase is;

⇒ 6/5+y

Option B is true.

Learn more about the mathematical expression visit:

https://brainly.com/question/1852123

#SPJ2

Factor this polynomial using the GCF: 3xy^2 + 3xy^2 - 3xy


3xy(y + x - 1)


-3xy(y + x + 1)


3x(y2 + x - 1)


3x^2(y2 + 1 - 1)

Answers

3xy^2 + 3yx^2 - 3xy....GCF is 3xy

3xy(y + x - 1) <==

how do you solve this absolute value equation? ∣x−2∣=∣4+x∣

Answers

l x - 2 l = l 4 + x l

Remember : Absolute is just the distance from zero.

Ex : l -4 l turns into 4, as it is 4 spaces away from zero on a number line :)

l x - 2 l turns into x + 2

l 4 + x l stays the same.

So, our equation now looks like this :

x + 2 = 4 + x

So, we're basically just trying to get x by itself.

So, subtract 2 from both sides.

x = 4 + x - 2

Then, subtract x from both sides.

x - x = 4 -2 

0 = 2

Therefore, there are no solutions to this equation :)

~Hope I helped!~

what is cos of negative pi/3?
what is sin of negative pi/3?

Answers

pi/3 is equivalent to 60 degrees, as 2pi is equal to 360 degrees. cos(60) in a triangle yields 1/2, and sin(60) yields (3^(1/2))/2. Thus, -pi/3, or -60 degrees would be a fourth quadrant point on the unit circle and these values would be negative as well, at cos(-pi/3)=-1/2 and sin(-pi/3)=-(3^(1/2))/2 
Cosine is even function, so:

[tex]$\cos(-\frac{\pi}{3})=\cos(\frac{\pi}{3})=\frac{1}{2} [/tex]

and sine is odd function, so:

[tex]$\sin(-\frac{\pi}{3})=-\sin(\frac{\pi}{3})=-\frac{\sqrt{3}}{2} [/tex]
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