use elimination to solve. 2 Math questions?

[Angelbaby58]

11.Use elimination to solve.
x/2 + 2y = 9
2x - y = 18
a. (6,-6)
b. (6,3)
c. (10,2)
d. (2,-16)

12.Use elimination to solve.
4x - y = -3
5x + 2y = -20
a. (-1,1)
b. (-2,-5)
c. (-1,-1)
d. (-5,2)