Answer
non collinear
Work Step by Step
D(-1,-1), E(2,-2) and F(5,-5)
To find D,E,F are collinear or not
We need to find out the slope of DE and EF
m(DE) =m = $\frac{-2-(-1)}{2-(-1)}$ = $\frac{-3}{2}$
m(EF) =m = $\frac{-5-(-2)}{5-2)}$ = $\frac{-3}{3}$ = -1
m(AB) $\ne$ m(BC)
therefore D,E,F are non collinear
