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Determine whether following points are c...

Determine whether following points are collinear.
`D(-2,-3), E(1,0), F(2,1)`

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`D(-2,-3),E(1,0)` and `F(2,1)`
Slope of line `DE=(0-(-3))/(1-(-2))`
`=(0+3)/(1+2)`
`=3/3=1`
Slope of line `EF=(1-0)/(2-1)`
`=1/1=1`
Slope of line DE `=` slope of line EF and E is the common point.
`:.` points D,E and F are collinear.
Points `D(-2,-3), E(1,0)` and `F(2,1)` aare collinear.
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