#### Answer

The constant of variation is $189$.
The inverse variation equation is $y=\frac{189}{x}$.

#### Work Step by Step

$y=\frac{k}{x}$
$y=63; x=3$
$63=\frac{k}{(3)}$
$63\times3=k$
$189=k$
The constant of variation is $189$.
The inverse variation equation is $y=\frac{189}{x}$.