waecmaths question:
If x and y are variable and k is a constant , which of the following describes an inverse relationship between x and y
Option A:
$y=kx$
Option B:
$y=\tfrac{k}{x}$
Option C:
$y=k\sqrt{x}$
Option D:
$y=x+k$
waecmaths solution:
$\begin{align} & y\propto \frac{1}{x} \\ & y=\frac{k}{x} \\\end{align}$
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