To find the midpoint between two points, first we must find the mid point between the x coordiates and then the y coordinates.
The x coordiate of A is 8 and the x coordiate of B is 2.
The midle value between 8 and 2 is found by summing them and dividing by 2:
(8+2)/2 = 10/2 = 5
Now if we do the same for the y coordinates:
(-1+5)/2 = 4/2 = 2
So we have found the mid point of A and B to be
(5,2)
Top Tip 1: Remeber the x value is always written first when you write coordinates!
Top Tip 2: Don't forget BODMAS, calculate the sum in the bracket first THEN do the division!