Question

For the following system, if you isolated y in the second equation to use the Substitution Method, what expression would you substitute into the first equation? 2x + y = 2 x − y = −6

Answer 1

I think the question is just asking you to solve the second equation for y

Answer 2

Can you do that?

Answer 3

−6 − x

−6 + x

6 − x

6 + x

Answer 4

You're going to have to do the thinking. You need to get y by itself. You can add/subtract/multiply/divide the same thing to each side of the equation in order to achieve this.

Answer 5

there is 2 ways to do this. It's personal preference. I'll do the first step.

-y = -6-x

Answer 6

They want you to substitute x − y = −6 into the second equation. To do this, you solve for y.
x - y = -6
Subtract x from both sides.
- y = -x - 6
Divide both sides by -1.
y = x + 6

Answer 7

All in all, you would substitute x + 6 into the first equation. So that would be your answer. (: