$\"\"$

\

The points are $\"\"$ .

\

Let $\"\"$

\

(Apply formula: $\"\"$ )

\

$\"\"$ (Substitute the points) $\"\"$

\

$\"\"$

\

$\"\"$

\

The value of determinant is not zero, so the three points

\

are do not lie on the same line. $\"\"$

\

The three points are not collinear.