Question

If y varies inversely as x with a constant of -3, what is x when y is 15?

Answer 1

If y varies inversely as x with a constant of -3

So,

$y=-\frac{3}{x}$

When y = 15, solve for x

So,

$\begin{gathered} 15=-\frac{3}{x} \\ 15x=-3 \\ x=-\frac{3}{15}=-\frac{1}{5}=-0.2 \end{gathered}$

So, when y = 15 , x = -0.2