Solve for both systems 9x+6z=120 and 8x + z = 20

8x + z = 20

8x-8x + z = 20-8x

z = 20-8x

9x+6z=120

9x+6(20-8x)=120

9x+6(20) (6)(-8x)=120

9x+120-48x=120

120-39x=120

120-39x-120=120-120

-39x=0

-39x/-39=0/-39

x=0

z = 20-8x

z = 20-8(0)

z = 20-0=20