A point P divides the line segment MN such that MP : P N = 2 : 1. The coordinates of
M and N are (−2, 2) and (1, −1) respectively. What will be the slope of the line passing
through P and the point (1, 1)? while using section formula , how to decide which one to take as x1,y1 and x2,y2 for (−2, 2) and (1, −1) ?