WAEC Mathematics 2012 Paper

Concept:In inverse relationship, one variable equals a constant divided by the other variable.Explanation:If $x$ and $y$ are inversely related, then their product is constant.So, $xy = k$, where $k$ is a constant.Rearranging gives $y = \frac{k}{x}$.This also means as $x$ increases, $y$ decreases proportionally.Given the options, only $y = \frac{k}{x}$ matches this condition.The other options show direct, square-root, or additive relationships.Answer:$y = \frac{k}{x}$, which is option B.