Check the picture below.
[tex]\bf (\stackrel{x_1}{0}~,~\stackrel{y_1}{16})\qquad (\stackrel{x_2}{10}~,~\stackrel{y_2}{8}) \\\\\\ \stackrel{slope}{m}\implies \cfrac{\stackrel{rise} {\stackrel{y_2}{8}-\stackrel{y1}{16}}}{\underset{run} {\underset{x_2}{10}-\underset{x_1}{0}}}\implies \cfrac{8}{10}\implies \cfrac{4}{5}[/tex]
