Question

I don't not understand substation for this problem y=x+6 then y=2x-7

Answer 1

`y=x+6\\ y=2x-7\\\\ x+6=2x-7\\ 2x-x=6+7\\ x=13\\\\ y=13+6\\ y=18\\\\ \boxed{(x,y)=(13,18)}`