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yarga [219]
3 years ago
15

How do i solve systems of equations by elimination?

Mathematics
1 answer:
stiv31 [10]3 years ago
6 0
First make sure that one of the variable has the same coefficient in each equations. 

For example lets use:
y=x+3
2y=3x-1

Since neither the y's or x's are the same, we must multiply the equations to make them the same. I am going to multiply the first equation by 2 so I can eliminate the y's.

So we get:
2y=2x+3
2y=3x-1

Then we subtract the second equation from the first to eliminate the y's. So we end up with 0=-x+4 and now we solve for x
0=-x+4
x=4 

Now we plug in our x into either original to get the y-value. I am using the first
y=x+3
y=4+3
So the x=4 and y=7

Hope this helps!
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Write the ratio as a ratio of whole numbers in lowest terms<br><br> $1.00 to $0.80
diamong [38]
5/4
as 1.00/0.80 = 100/80
and then when you simplify it the answer would be 4/5.
6 0
3 years ago
Help please, what’s: 5x-7+2-2x=-26
svetoff [14.1K]

Answer:

7

Let's solve your equation step-by-step.

5x−7+2−2x=−26

Step 1: Simplify both sides of the equation.

5x−7+2−2x=−26

5x+−7+2+−2x=−26

(5x+−2x)+(−7+2)=−26(Combine Like Terms)

3x+−5=−26

3x−5=−26

Step 2: Add 5 to both sides.

3x−5+5=−26+5

3x=−21

Step 3: Divide both sides by 3.

3x

3

=

−21

3

x=−7

Answer:

x=−7

3 0
3 years ago
Read 2 more answers
I keep believing the answer is either 18,000 or 1,800 but im incorrect. Can someone please help me?? I use the formula A^2 *2*A*
Yuri [45]

The base is a square, so the area of the square is (10 cm)² = 100 cm²

To find the area of each triangle use the formula

base • height

10 cm • 9 cm = 90 cm²

now multiply by the number of triangles

90 cm • 4 = 360 cm²

Add the area of the square:

100 cm² + 360 cm² = 460 cm²

I hope it's correct

4 0
2 years ago
Read 2 more answers
Write the letters of the expressions that are equivalent to the given expression.
Tresset [83]

Answer: A.) 10x + 15

Step-by-step explanation:

You would distribute (multiply) the 5 to the 2x which would then make it 10x and you would distribute (multiply) the 5 to the 3 which would then make it 15. Because the 5 is a positive number the sign stays the same.

Therefore, 10x + 15 is your answer.

3 0
3 years ago
28-(3x+4)=2(x+6)+x How would you solve this??? Please add step by step explanation
enot [183]

Answer:

x = 2

Step-by-step explanation:

7 0
3 years ago
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