Question

Could someone help me do this using substitution I don't know how to do this for math

Answer 1

If X=y-7 you put that into the other problem: y-7=2-8y. Then you combine like terms: 9y=9. Get the unknown by itself: divide both sides by 9: y=1. Then you put what y= into the first problem: X=1-7 then X=-6.
So X=-6, Y=1. :) hope this helps!

Answer 2

x=y-7 and x=2-8y if there is a solution x=x so

y-7=2-8y add 7 to both sides

y=9-8y add 8y to both sides

9y=9 divide both sides by 9

y=1, and since x=y-7

x=1-7=-6

So the solution is the point (-6, 1)