Question

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

2x + y = 8
-x - 3y = -12

3y + 12

-3y + 12

3y - 12

-3y - 12

Answer 1

idk why the question says isolation of x because isolation if i'm correct just means seperating them, not solving for x. If they mean solving for x, then you'll get x=f(y)

in this case, since you've solved for x, you can now substitute this f(y) into the x variable of the first equation

Answer 2

so all you need to do is solve for x and whatever is your f(y) will be the expression

Answer 3

hint: add x to both sides, then add 12 to both sides for your answer

Answer 4

ok thanks