Solve the following systems using substitution. Write your answer as an ordered pair (x, y).
-5x + y = -3
3x - 8y = 24
a) (x, y) = (3, -6)
b) (x, y) = (-3, 6)
c) (x, y) = (3, 6)
d) (x, y) = (-3, -6)