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# Math...Show that the points are collinear? Watch

1. (-2a,5a) (0,4a) (6a,a)
2. GCSE? vectors?
3. Call the points A,B and C

If the gradient of AB is equal to BC where B is a common point then they are collinear.

i.e

AB=
4a-5a -a/2a= -1/2
------ =
0-(-2a)

BC=
a-4a
------ = -3a/6a = -1/2
6a-0

Since mAB=mBC where B is a common pt therefore the pts are collinear.

m is just notation for gradient
4. thx

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Updated: December 9, 2010
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