Solve for both systems 7x+6z=80 and 4x + 6z = 74

4x + 6z = 74

4x-6z + 6z = 74-6z

4x= 74-6z

4x/4= 74-6z/4

x=18.5-1.5z

7x+6z=80

7(18.5-1.5z)+6z=80

7(18.5) (7)(-1.5z)+6z=80

129.5--10.5z+6z=80

129.5-4.5z=80

129.5-4.5z-129.5=80-129.5

-4.5z=-49.5

-4.5z/-4.5=-49.5/-4.5

z=11

x=18.5-1.5z

x=18.5-1.5(11)

x=18.5-16.5=2