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Mathematics 13 Online
OpenStudy (anonymous):

Suppose y varies directly as x, and Y=80 when X=16. Which of the following statements is true? A.The constant of variation is 5. B.The variable y does not vary directly with x. C.The constant of variation is -5. D.The constant of variation is 1 over 5

jimthompson5910 (jim_thompson5910):

"Suppose y varies directly as x" means that y = kx where k is some fixed constant

jimthompson5910 (jim_thompson5910):

y = kx 80 = k*16 ... plug in x = 16 and y = 80 k = ???

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