Chapter 3 - Review - Page 196: 55

$m=-3$

Work Step by Step

Using $m=\dfrac{y_1-y_2}{x_1-x_2}$ (or the Slope Formula), the slope, $m$, of the line through $( 2,8 ) \text{ and } ( 6,-4 )$ is \begin{array}{l} m=\dfrac{8-(-4)}{2-6} \\\\ m=\dfrac{8+4}{2-6} \\\\ m=\dfrac{12}{-4} \\\\ m=-3 .\end{array}

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