SOLUTION: i have to use the midpoint formula and i have the midpoint and one end and i have to find the other end ex) A------B------C (2,-3) (-5,1) (?)

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Question 130828This question is from textbook holt, rinehart and winston algebra 2
: i have to use the midpoint formula and i have the midpoint and one end and i have to find the other end
ex) A------B------C
(2,-3) (-5,1) (?) This question is from textbook holt, rinehart and winston algebra 2

Answer by solver91311(24713) About Me  (Show Source):
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The midpoint of the segment with endpoints (x%5B1%5D,y%5B1%5D) and (x%5B2%5D,y%5B2%5D) is (%28x%5B1%5D%2Bx%5B2%5D%29%2F2,%28y%5B1%5D%2By%5B2%5D%29%2F2)

That means that -5 is the average of 2 and some other number. In other words, %282%2Bx%29%2F2=-5.

So:
2%2Bx=-10
x=-12

Likewise,
%28-3%2By%29%2F2=1
-3%2By=2
y=5

Therefore the other endpoint is: (-12,5)