Solve for both systems 9z+y=51 and 5z + 2y = 37

9z+y=51

9z-9z+y=51-9z

y=51-9z

5z + 2y = 37

5z + 2(51-9z) = 37

5z + 2(51) (2)(-9z) = 37

5z+102-18z=37

102-13z=37

102-13z-102=37-102

-13z=-65

-13z/-13=-65/-13

z=5

y=51-9z

y=51-9(5)

y=51-45=6