Suppose P is the point (5,3) and Q is the point (3,8). Find point T such that Q is the midpoint of segment PT.
We need to move from point Q the same distance as from P to Q
for 'x' moving from P to Q we go from 5 to 3 or -2 go -2 MORE from Q ....from 3 to 1
for 'y' moving from 3 to 8 is + 5 move + 5 more from Q to 13
Point T is then 1,13