1.

The midpoint of segment AB is P(0,4). If the coordinates of B are (-2, 3), then the coordinates of A are (a) (2,5) (b) (-2,-5) (c) (2,9) (d) (-2,11)

Answer»

Correct answer is (a) (2,5)

Let (x,y) be the coordinates of A. then,

\(0=\frac{-2\,+\,x}{2} \Rightarrow x=2\)

\(4=\frac{3\,+\,y}{2}\Rightarrow y=8-3=5\)

Thus, the coordinates of A are (2,5).



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