$\"\"$

The differential equation is $\"\"$ .

The function is increasing when $\"\"$ .

As $\"\"$ , when $\"\"$ .

As $\"\"$ is always positive, sign of $\"\"$ depends on the sign of $\"\"$ .

sign of $\"\"$ is positive in first and second quadrants.

Thus, $\"\"$ in first and second quadrants.

The solution function is increasing in first and second quadrants.

$\"\"$

The solution function is increasing in first and second quadrants.