Solve the system.

7x + 2y = 24
8x + 2y = 30

Solve the system.

4x + 11y = 9
x + 11y = −6

Solve the system.

−6x + 6y = 6
-6x + 3y = −12

Solve the system.

3x + 2y = 9
3x − 7y = -18