Line segment CD has a midpoint at (1, 2). If endpoint C is located at (–5, 3), find the ordered pair represented by the other endpoint D

Answer 1

(7, 1) is the other end point D

the x coordinate increases from -5 to 1 = 6. Add 6 to 1 to get 7 for D's x coordinate

the y coordinate decreases from 3 to 2 = 1. subtract 1 from 2 to get 1 for D's y coordinate.

the midpoint is the average of the endpoints. (7-5)/2 = 2/2 = 1 for the midpoint's x coordinate

(3+1)/2 = 4/2 = 2 = the y coordinate of the midpoint

It might help to do a rough sketch and plot the points.