Question

Solve using the substitution method.
x-y=4
2x+8y=-72

Answer 1

first look at x-y=4 and isolate either x or y, your choice. (ex if i wanted to isolate x i would minus y from each side.) use that equation to plug into the next equation. (ex. if i isolated x, and the equation was x=4+y, then id plug 4+y into any x's in the second equation. then i would solve for y, then plug the answer into the y's, then find x.)