Solve the problem.Suppose that y is directly proportional to x and that y = 40 when x = 8. Find the constant of proportionality k. Then use y = kx to find y when x = 17.

A. k = 320; y = 
B. k = - 5; y = - 85
C. k = 5; y = 85
D. k = 7; y = 119


Answer: C

Mathematics

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