Chapter 5 - Linear Functions - 5-1 Rate of Change and Slope - Practice and Problem-Solving Exercises - Page 297: 35

$m=0$

To find the slope, we use the formula $m=\frac{y_2-y_1}{x_2-x_1}$. We plug in the $x$ and $y$ values from the given coordinate pairs: $m=\frac{\frac{4}{7}-\frac{4}{7}}{8-(-\frac{1}{2})}$ We simplify above and below the fraction bar with subtraction: $m=\frac{0}{8.5}$ We divide the fraction: $m=0$