Solve the following systems using substitution. Write your answer as an ordered pair (x, y).
-5x + y = -2
-3x + 6y = -12
a) (x, y) = (2, -12)
b) (x, y) = (-2, 12)
c) (x, y) = (-2, -12)
d) (x, y) = (2, 12)