Posted by drew on .
Find the other endpoint of the line segment with the given endpoint and mid point.
1. Endpoint:(1, 9), midpoint: (9, 10)
2. Endpoint: (2, 5), midpoint: (5, 1)
3. Endpoint:(9, 10), midpoint: (4, 8)

trig 
Reiny,
I will do the 2nd
You do the others the same way....
Let the other endpoint be (x,y)
(x+2)/2 = 5 and (y+5)/2 = 1
x+2 = 10 and y+5 = 2
x = 8 and y = 3
the other endpoint is (8,3)