Question

F(x) varies inversely with x and f(x) = –15 when x = 30. What is the inverse variation equation?
a. f(x) = -5/x
b. f(x) = -2/x
c. f(x) = -90/x
d. f(x) = -450/x

Answer 1

Wait i think it is D.

Answer 2

f(x) = -15, x=30
-15 = k/30
k = (-15)(30)
k = -450
f(x) = -450/x
right?

Answer 3

absolutely correct :)