What is the solution of this system of equations

4x+9y=-33

4x-3y=27

4x +9y = -33
4x -3y = 27

0 12y = -60
       y = -60/12

  y = - 5 

4x +9(-5)= -33

4x -45 = -33

4x = 12

x = 12/4

x = 3
y = -5

hope this will help you