Solve for both systems 4x + 4y = 12 and - 4x - y = - 30

4x + 4y = 12

4x-4x + 4y = 12-4x

4y = 12-4x

4y/4 = 12-4x/4

y=3-x

- 4x - y = - 30

- 4x - (3-x)= - 30

-4x+3+x=-30

3x+3=-30

3x+3-3=-30-3

3x=-33

3x/3=-33/3

x=-11

y=3-x

y=3-(-11)=3+11=14