Question

The function f(x) varies inversely with x and f(x) = -15 when x = 30

what is the inverse variation equation

Answer 1

f(x) = k/x

f(30) = -15
⇒ k/30 = -15
⇒ k = 30 * -15 = -450

f(x) = -450/x

Hope it helps!