\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Pour \(C\left(\textcolor{colordef}{3},\, \textcolor{colorprop}{1}\right)\) et \(D\left(\textcolor{colordef}{1},\, \textcolor{colorprop}{3}\right)\), calcule la pente de la droite \(\LineFr{CD}\).
Pente de \(\LineFr{CD}\) =