Solve each system using elimination.
3x+3y=27
x-3y=-11
9. 2x+4y=22
2x-2y=-8
11. 5x-y=0
3x+y=24

Add those equations together
1.  4x = 16, x = 4

2. Multiple the second one by 2
2x+4y=22
4x-4y=-16
6x = 6, x = 1

3. Add them together
8x = 24, x = 3

In 2, we are asked to solve the systems of equations to solve for the variables using elimination. 
 3x + 3y = 27-3(x - 3y = -11)      12 y  = 60        y = 5        x = 4
 2x + 4y = 22 2x - 2y = -8     6y  = 30     y   = 5     x   = 1
  5x - y = 0  3x  + y = 24  8x    =  24   x = 3   y = 15