Solve the system using elimination.

3x + 3y = –9
3x – 3y = 21

Solve the system using elimination.

5x + 2y = –19
2x – 2y = –16

Solve the system using elimination.

2x + 3y = 1
2x – 3y = –17

Solve the system using elimination.

2x + 3y = –5
5x – 3y = 40

Solve the system using elimination.

x + 4y = 4
x – 4y = –12