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Point P is the midpoint of segment AB. Co-ordinates of P are (5, -1) and A are (2, -4). What are the co-ordinates of point B?
Mid-point = $$(\frac{x_{1}+x_{2}}{2} , \frac{y_{1}+y_{2}}{2})$$
(5 , -1) = $$(\frac{2+x}{2} , \frac{-4+y}{2})$$
2+x = 10 so x = 8
-4+y = -2 so y = 2
so the answer is option B.
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