Solve for 4x - y = 23 and 4x + y = 33

4x + y = 33

4x + y-4x = 33-4x

y=33-4x

4x - y = 23

4x - (33-4x) = 23

4x - 33+4x = 23

8x - 33 = 23

8x - 33+33 = 23+33

8x=56

8x/8=56/8

x=7

y=33-4x

y=33-4(7)

y=33-28

y=5