Prove that the points (- 2, 5), (0, 1) and (2, - 3) are collinear.
Vertices are: A(- 2, 5), B(0, 1) and C(2, - 3)
Using distance formula =
Length of side AB =
= 
= 
=
units
Length of side BC =
= 
= 
=
units
Length of side AC =
= 
= 
=
units
Since length of AB + BC = AC, therefore points are collinear.
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