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Rigamonk · Answer 1 · 2018-09-28T16:20:11+0000

If the midpoint is (-1,-2) and an endpoint is (-9,-4) we can say

(-9+x)/2=-1 and (-4+y)/2=-2 so

-9+x=-2 and -4+y=-4

x=7 and y=0

So the other endpoint is (7,0)

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