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Question 41
Point P is the midpoint of segment AB. Co-ordinates of P are (1 , 3) and A are (-3 , 8). What are the co-ordinates of point B?
Solution
Mid-point = $$(\frac{x_{1}+x_{2}}{2} , \frac{y_{1}+y_{2}}{2})$$
(1 , 3) =Â $$(\frac{-3+x}{2} , \frac{8+y}{2})$$
-3+x = 2 so x = 5
8+y = 6 so y = -2
so the answer is option D.
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