SOLUTION: Suppose y is directly proportional to x and that y=20 when x=4 what is the constant of proportionality k?

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Question 995208: Suppose y is directly proportional to x and that y=20 when x=4
what is the constant of proportionality k?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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Suppose y is directly proportional to x
y = kx
and that y=20 when x=4
20 = 4k
what is the constant of proportionality k?
k = 20/4
k = 5