SOLUTION: find the coordinates of the missing endpoint if B is the Midpoint of line segment AC. C(0,0) , B(5.-6) I don't need you to work this problem, I just need to know how to do it.

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Question 487899: find the coordinates of the missing endpoint if B is the Midpoint of line segment AC.
C(0,0) , B(5.-6)
I don't need you to work this problem, I just need to know how to do it. I will be cheating if you just tell me the answer.
Found 2 solutions by chessace, josmiceli:
Answer by chessace(471) (Show Source):
You can put this solution on YOUR website!
Good attitude!
If B is the midpoint, each of it's coordinates are too.
So find each coordinate of A such that when averaged with C's result in B's.
0.5(Ax+Cx)=Bx

Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website!
B(5,-6) has the form B(x,y)
Call the other endpoint A(x,y)
given:

and

the other endpoint is A(10,-12)
I am just finding the midpoints
along the x-axis and then the y-axis