Midpoint
The midpoint of an interval lies exactly halfway between the two endpoints.
To find the midpoint we:
consider the x-coordinates and y-coordinates separately
Find the average by adding and dividing by 2
x-value of midpoint = (-3 + 6) ÷ 2
= 1.5
y-value of midpoint = (2+8) ÷ 2
= 5
(Or mentally work out what is half-way between the two endpoints.)
The above picture shows the midpoint formula and a nice way to set out your working.