By plotting the following points on the same graph paper, check whether they are collinear or not : (i) (3, 5), (1, 1) and (0, -1) (ii) (-2, -1), (-1, - 4) and (- 4, 1)
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If [x1(y2 - y3) + x2( y3 - y1)+ x3(y1 - y2)] = 0. then (X1,Y1),(X2,Y2),(X3,Y3) are collinear points .
(3, 5), (1, 1) and (0, -1)
(3(1+1)+1(-1-5)+0)
6-6+0=0
the points (3,5),(1,1),(0,-1) are collinear
(-2, -1), (-1, - 4) and (- 4, 1)
(-2(-5)+-1(2)+-4(3))
10-2-12=-4
the points (-2, -1), (-1, - 4) and (- 4, 1) are not collinear
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