This is the Midpoint formula. This formula is used to find the middle point that separates a line segment into two equal segments. Lets say you have two points. One is (3,4), and the other is (2,3)
First, you would take the numbers and plug them into the formula. That is done by the order of the numbers, as seen in the picture.
Second, solve the formula by adding the numbers, and then dividing them.
Thats it! You have your midpoint! In this example, my midpoint was (2.5 , 3.5). Just be sure to plot it correctly!