Q20: By using the concept of equation of a line, prove that the three points and are collinear.
Points are collinear, means they lies on same line
Now, given points are and
equation of line passing through point A and B is
Therefore, the equation of line passing through A and B is
Now, Equation of line passing through point B and C is
Therefore, equation of line passing through point B and C is
We can clearly see that Equation of line passing through point A and B and through B and C is the same.
By this, we can say that points and are collinear points