Math Algebra 7.2.3.2

19. xy2z + x2yz = 16z. In the equation above, if x =2 what is the value of y ?
A. 1
B. 2
C. 4
D. Cannot tell from the information given.
20. (2x + 2) (2y + 3) = 78. In the equation above, if x is equal to 2, what is the value of y ?
A. 2
B. 5
C. 4
D. 6
21. x2 + y3 + z4 = 130. In the equation above, if x2 = 4 and y2 = 25, what is the value of z ?
A. 1
B. 2
C. 3
D. 10
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