I think this is supposed to be
-5x - 3y = 12
y = x - 12
Sub the second equation into the first for y and we have
-5x - 3 ( x - 12) = 12 simplify
-5x - 3x + 36 = 12
-8x + 36 = 12 subtract 36 from both sides
-8x = - 24 divide both sides by -8
x = 3
And y = 3 - 12 = -9
So you are correct!!!!.... (3 , -9) is the solution
