$\"\"$

The equation is $\"\"$ .

Rewrite the equation is $\"\"$ .

Since, $\"\"$ varies directly as $\"\"$ and $\"\"$ varies inversely as $\"\"$ .

Find the which type of variation.

The quotients of $\"\"$ or $\"\"$ represent constant value, then it represents the combined variation.

$\"\"$

The equation represents the combined variation. \ \