Donate or volunteer today. Recall that the average of two numbers is found by dividing their sum by two. Its x value is halfway between the two x values.
In other words we are simply finding the average of the two x-values and the two y-values.
Midpoint b2 b1 b2 b1 2 a2 a1 a2 a1 2. Midpoint of a Line Segment. The advantage of the midpoint method is that one obtains the same elasticity between two price points whether there is a price increase or decrease. Midpoint Formula The Midpoint Formula works exactly the same way.