$\"\"$

The points are $\"\"$ and $\"\"$ .

If the initial point is $\"\"$ and the terminal point is $\"\"$ , then the position vector is $\"\"$ .

Substitute the points $\"\"$ and $\"\"$ in

$\"\"$ .

$\"\"$

The position vector is $\"\"$ .

$\"\"$

The position vector is $\"\"$ .