### Solve each system by the elimination method.

Solve each system by the elimination method. Check each solution. See Examples 1 and 2. 1. x + y = 2 3. 2x + y = -5 5. 3x + 2y = 0 2x - y = -5 x - y = 2 -3x - y = 3 2. 3x - y = -12 4. 2x + y = -15 6 . 5x - y = 5