Question

6x-7y=21

7y-6x=-21

Answer 1

6x-7y=21

Two Answers- x=?, y=?

Solve the Equation first for x:
x=(7(y+3))/6

plug this back into the equation for xand now because it's one variable (y) you can solve for by itself. Once you have y you can just plug it in to solve for x.