[tex] \bf A(\stackrel{x_1}{0}~,~\stackrel{y_1}{1})\qquad
B(\stackrel{x_2}{2}~,~\stackrel{y_2}{7})
\\\\\\
slope = m\implies
\cfrac{\stackrel{rise}{ y_2- y_1}}{\stackrel{run}{ x_2- x_1}}\implies \cfrac{7-1}{2-0}\implies \cfrac{6}{2}\implies 3
\\\\[-0.35em]
\rule{34em}{0.25pt}\\\\
C(\stackrel{x_1}{2}~,~\stackrel{y_1}{5})\qquad
D(\stackrel{x_2}{3}~,~\stackrel{y_2}{1})
\\\\\\
slope = m\implies
\cfrac{\stackrel{rise}{ y_2- y_1}}{\stackrel{run}{ x_2- x_1}}\implies \cfrac{1-5}{3-2}\implies \cfrac{-4}{1}\implies -4 [/tex]
