$\"\"$

The condition is $\"\"$ and $\"\"$ .

$\"\"$ plane is positive in quadrant I and III.

$\"\"$ , it is possible below $\"\"$ plane by 3 units.

So the point $\"\"$ lies on 3 units below $\"\"$ plane , and below either quadrant I and III.

$\"\"$

The point $\"\"$ lies on 3 units below $\"\"$ plane , and below either quadrant I and III.