Question

Please help. I will fan and give medal to whoever succeeds in helping me.

For the following system, if you isolated y in the first equation to use the Substitution Method, what expression would you substitute into the second equation?

4x − y = 8
2x + 3y = 9

8 − 4x

8 + 4x

−8 + 4x

−8 − 4x

Answer 1

-y = 8-4x

So when you switch the negative what happens?

Answer 2

I'm not sure what you mean by "switch the negative".

Answer 3

do the opposite sign so 8= -8

Answer 4

When you divide out the negative what happens to (8-4x)

Answer 5

so what is the opposite of -4 ?

Answer 6

4.

Answer 7

Yep @warningiflirt is right. -1 means the opposite. So take the opposite of 8-4x

Answer 8

so you have −8 + 4x

Answer 9

see how I did that?

Answer 10

Yeah.

Answer 11

-y = (8 -4x)
y = -(8-4x)

If you know how to distribute it makes it
y = -8 + 4x

Answer 12

Cool