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Question
Show that the following points are collinear:
(i) A(2,-2), B(-3, 8) and C(-1, 4)
Solution
`"Let " A(x_1=2,y_1=-2) B (x_2=-3, y_2=8) and C(x_3=-1,y_3=4)` be the given points.
`No w , x_1 (y_1-y)3)+x_2(y_3-y_1) + x_3(y_1-y_2)`
=2(8-4)+(-3)(4+2)+(-1)(-2-8)
=8-18+10
=0
Hence, the given points are collinear.
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