Solve these systems of equations Using the elimination method.
a). 3x + y = 13 b) 6x - y = 14
x - 5y = 15 2x + y = 12
C3x - 4y = 22
2x + 5y = 7
a). 3x + y = 13 b) 6x - y = 14
x - 5y = 15 2x + y = 12
C3x - 4y = 22