$\"\"$

The rate of change of $\"\"$ with respect to $\"\"$ varies jointly as $\"\"$ and $\"\"$ .

From the statement the function can be written as $\"\"$ .

Seperate the variables by bringing $\"\"$ terms to the left side of the equation.

$\"\"$

Apply integration on both sides.

$\"\"$

The value of $\"\"$ is defined as $\"\"$

$\"\"$ .

Therefore, the general solution is $\"\"$ . $\"\"$

The general solution is $\"\"$ .