We need slope of all lines ?
Slope of JK:-
[tex]\\ \sf\longmapsto m=\dfrac{1+1}{0+5}=\dfrac{2}{5}[/tex]
Slope of KL:-
[tex]\\ \sf\longmapsto m=\dfrac{-5-1}{2-0}=\dfrac{-6}{0}=-3[/tex]
Slope of JL
[tex]\\ \sf\longmapsto m=\dfrac{-5-1}{2+5}=\dfrac{-6}{7}[/tex]