Plot the points A (6,6),B(4,4),C(-1,-1) in the cartesian plane and show that the points are collinear.
Answers
Given : points A (6,6),B(4,4),C(-1,-1)
To Find : show that the points are collinear.
Solution:
points A (6,6),B(4,4),C(-1,-1)
if slope of AB = slope of AC then points are collinear
Slope of AB = ( 4 - 6)/(4 - 6) = 1
Slope of AC = ( -1 - 6)/(-1 - 6) = 1
Slope of AB = Slope of AC
Hence points are collinear
Another method
points are collinear if Area = 0
= (1/2) | 6 (4 -(-1)) - 4(6 -(-1)) - 1(6 - 4) |
= (1/2) | 30 - 28 - 2 |
= (1/2) | 0 |
= 0
Hence points are collinear
Learn More:
Using determinants, show that the following points are collinear. (i) A .
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Collinear points by trigonometry value are A
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