Question

If $Y$ varies inversely as $x$ and if $y=4$ when $x=72$. Find the constant of variation.

Answer 1

$\begin{array}{c}y=\frac{k}{x}\\ y=\frac{k}{x}\\ y=4whenx=72\\ 4=\frac{k}{72}\\ k=4\times 72\\ k=288\end{array}$

constant of variation