11z+3y=83 3z + 3y = 27

3z + 3y = 27

3z+3y-3y=27-3y

3z=27-3y

3z/3=27-3y/3

z=9-y

11z+3y=83 sub in z solve for y

11(9-y)+3y=83

99-11y+3y=83

99-8y=83

99-99-8y=83-99

-8y=-16

-8y/-8=-16/-8

y=2

z=9-y

z=9-2

z=7