Originally Posted by

**ziaharipur** I have following question.

Prove that (1,1) , (-2,-8) and (4,10) lie on straight line.

Now its very easy if we use the slope technique.. that is, we find slope of the line joining the first two points (1,1) and (-2,-8), which is 3... similarly we find slope of the line joining the points (-2,-8) and (4,10) which is also 3. As the slopes are equal, therefore the points lie on a straight line.

**But the problem is here we need to prove it by Distance formula. how can we do this?**