Question

y varies inversely with x. Find the inverse variation equation if x = -3 when y = 30.
y/x = -10
xy = -10
y/x = -90
xy = -90

Answer 1

Inverse relations are of the form \(xy = C\) and direct relations are of the form \(\frac{x}{y}=C\) for some constant \(C\), so you know it's either the second or fourth choice. Which one of them satisfies \(x=-3\) and \(y=30\)?