Question

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how do i start this problem?

Find the coordinates of the other endpoint when you are given the midpoint (point M) and one of the endpoints (point P).
P = (10, 6) and M = (-4, 8)



(-18, 10)

(2, 10)

(3, 7)

Answer 1

this is an example :
http://www.purplemath.com/learning/viewtopic.php?f=11&t=676

Answer 2

Assume the other end point has the coordinates (p, q)
The midpoint of (10,6) and (p,q) is ( (10+p)/2, (6+q)/2 ) = (-4, 8)
(10+p)/2 = -4
10+p = -8
p = -18

(6+q)/2 = 8
6+q = 16
q = 10

(-18,10)