Solve for both systems: 4y+12x=112 and -4y + 7x = 40

4y+12x=112

4y+12x-12x=112-12x

4y=112-12x

4y/4=112-12x/4

y=28-3x

-4y + 7x = 40

-4(28-3x) + 7x = 40

-4(28) (-4)(-3x) + 7x = 40

-112+12x+7x=40

-112+19x=40

-112+19x+112=40+112

19x=152

19x/19=152/19

x=8

y=28-3x

y=28-3(8)

y=28-24=4