By distance formula, show that the points (1, -1) (5, 2) and (9, 5) ar – InterviewSolution

1.

By distance formula, show that the points (1, -1) (5, 2) and (9, 5) are collinear.

Answer»

three points are collinear if x1(y2- y3) + x2(y3- y1) + x3(y1- y2) = 0

here, x1= 1 , x2= 5 , x3= 9 y1= - 1 , y2= 2 , y3= 51 (2 - 5) + 5 (5 + 1) + 9 (- 1 - 2) = 0- 3 + 30 - 27 = 00 = 0

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