Solve for both systems 9z+10x=69 and 6z + 7x = 48

9z+10x=69

9z-9z+10x=69-9z

10x=69-9z

10x/10=69-9z/10

x=6.9-.9z

6z + 7x = 48

6z + 7(6.9-.9z) = 48

6z + 7(6.9) (7)(-.9z) = 48

6z+48.3-6.3z=48

48.3-.3z=48

48.3-.3z-48.3=48-48.3

-.3z=-.3

-.3z/-.3=-.3/-.3

z=1

x=6.9-.9z

x=6.9-.9(1)

x=6.9-.9=6