## College Algebra (11th Edition)

$m=-2$
Using $m=\dfrac{y_1-y_2}{x_1-x_2}$ or the Slope Formula, the slope of the line passing through the given points $( 5,8 )$ and $( 3,12 )$ is \begin{array}{l}\require{cancel} m=\dfrac{8-12}{5-3} \\\\ m=\dfrac{-4}{2} \\\\ m=-2 .\end{array}