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If P(-1,1) is the midpoint of the line segment joining A(-3,b) and B(1, b+4) then b = ? (a) 1 (b) -1 (c) 2 (d) 0 |
Answer» Correct answer is (b) -1 The given ports are A(-3,b) and B(1,b + 4). Then, (x1 = -3,y1 = b) and (x2 = 1,y2 = b + 4) Therefore, \(x=\frac{[(-3)+1]}{2}\) = \(\frac{-2}{2}\) = -1 And \(y=\frac{[b\,+\,(b\,+\,4)]}{2}\) = \(\frac{2b\,+\,4}{2}\) = b + 2 But the midpoint is P(-1,1). Therefore, b + 2 = 1 \(\Rightarrow b=-1\) |
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