Question

Solve y = 3x – 12 by the substitution method.
2x – 3y = -13

Answer 1

sub in y:
2x-3(3x-12)=-13

Answer 2

Now solve:
2x-9x+36=-13
-7x=-39
x=39/7

Answer 3

*-7x=-49
x=7

Now plug x back into an equation and solve for y