Solve each of the following systems of equations. Find all solutions.
(a)
x + y = -1
3x - 4y + 2 = x + 8y - 3
(b) 3x - 4y + 2 = 0
10 - 10y = 10y - 15x + 3x - 4y
(a) (x,y) = (-5,1)
(b) (x,y) = (7/2, -17/2)