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Suppose y is directly proportional to x and that y = 40 when x=5.

Complete parts (a)and(b).

Find the constant of proportional k.
k=

(b)use y=ky to find y when x=9
y=

2 answers

I'm amazed! You're a college student and don't know the difference between a school and a school subject?

40 = 5 k
so
k = 8

y = 8 x

y(9) = 8*9 = 80 - 8 = 72

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