Question

can someone help me solve this by using elimination or substitution:
-4x+4y=4
5x-y=-13

Answer 1

you can divide the first equation by 4, and then add the equations.

Answer 2

y=2

Answer 3

@solomonzelman

Answer 4

i don't think so

Answer 5

i moved 4 to one side then divided 8 by 4,which gave me 2

Answer 6

y=2 is not correct

Answer 7

-4x+4y=4

when you divide this equation by 4, you get

- x + y = 1

Answer 8

-x + y = 1
5x - y = -13
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add the equations

Answer 9

x=-3?

Answer 10

This is not meant as a criticism :) but you and the other students need to learn to check your own answer and not asking a mentor to verify it.

How how you check your answer?

First calculate y from the equation

-x + y = 1 where you "suspect" x = -3

-(-3) + y = 1
3 + y = 1
y = 1 - 3

y = -2

Then plug x = -3 and y = -2 into the OTHER equation and see if it checks (is correct)

5x - y = -13

5(-3) - (-2) = -13 Is this correct?

Check and see, but don't ask me.