Chapter 3 - Introduction to Graphing - 3.5 Slope - 3.5 Exercise Set - Page 200: 49

$m=0$

Using $m=\dfrac{y_1-y_2}{x_1-x_2}$ or the Slope Formula, then the slope of the line containing the given points, $\left( -2,\dfrac{1}{2} \right) \text{ and } \left( -5,\dfrac{1}{2} \right)$, is \begin{array}{l} m=\dfrac{\dfrac{1}{2}-\dfrac{1}{2}}{-2-(-5)} \\\\ m=\dfrac{0}{3} \\\\ m=0 .\end{array}