[tex]\bf (\stackrel{x_1}{18}~,~\stackrel{y_1}{-65})\qquad (\stackrel{x_2}{84}~,~\stackrel{y_2}{-43}) \\\\\\ \stackrel{slope}{m}\implies \cfrac{\stackrel{rise} {\stackrel{y_2}{-43}-\stackrel{y1}{(-65)}}}{\underset{run} {\underset{x_2}{84}-\underset{x_1}{18}}}\implies \cfrac{-43+65}{66}\implies \cfrac{22}{66}\implies \cfrac{1}{3}[/tex]
