Let z vary jointly with x and y. Find the constant of variation k. Then, use 
to find z when x = 5 and y = 7.z = 4 when x = 10 and y = 2
A. k = 0.4; z = 14
B. k = 40; z = 1,400
C. k = 80; z = 2,800
D. k = 0.2; z = 7
Answer: D
Mathematics
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