Question

a is the point in coordination (1,3) b is the point with coordinates (7,8) find the coordinates of the midpoint of the line segment ab

Answer 1

The midpoint is the average of the coordinates of the endpoints.
M = (A + B)/2 = ((1+7)/2, (3+8)/2) = (4, 11/2)

The midpoint of AB is (4, 11/2).