Question

Suppose that y varies inversely with x. Write a function that models the inverse function. x = 15 when y = 2.

A. y=30/x

B. y=7.5x

C. y=15/2x

D. y=30x

Answer 1

Inverse variation means y=k/x (direct variation is y=kx)

You are given a point, so you can solve for the constant k...

2=k/15

k=30 so the function is:

y=30/x