[tex]\bf (\stackrel{x_1}{-1}~,~\stackrel{y_1}{2})\qquad
(\stackrel{x_2}{4}~,~\stackrel{y_2}{3})
\\\\\\
% slope = m
slope = m\implies
\cfrac{\stackrel{rise}{ y_2- y_1}}{\stackrel{run}{ x_2- x_1}}\implies \cfrac{3-2}{4-(-1)}\implies \cfrac{3-2}{4+1}\implies \cfrac{1}{5}[/tex]
