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6.Find the value of k, if the points A (-1, 1), B(5, 7) and C (8, k) are collinear. |
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Answer» ong>Answer: 1/2 [x1(y2-y3)+x2 (y3-y1) + X3(y1-y2)] = 0 7-7k +5k+10-9 = 0 8-2k=0 2k=8 k=8/2 = 4 |
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