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Determine whether following points are c...

Determine whether following points are collinear.
`L(2,5), M(3,3), N(5,1)`

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`L(2,5),M(3,3)` and `N(5,1)`
Slope of line `LM=(3-5)/(3-2)`
`=(-2)/1=-2`
Slope of line `MN=(1-3)/(5-3)`
`=(-2)/2=-1`
Slope of line `LM!=` slope of line MN.
`:.` Points L,M and N are not collinear.
Points `L(2,5),M(3,3)` and `N(5,1)` are not collinear.
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