\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
For \(C\left(\textcolor{colordef}{3},\, \textcolor{colorprop}{1}\right)\) and \(D\left(\textcolor{colordef}{1},\, \textcolor{colorprop}{3}\right)\), find the slope of the line \(\Line{CD}\).
Slope of \(\Line{CD}\) =