## Algebra and Trigonometry 10th Edition

If the lines are parallel, their slopes are the same. Slope of the line passing through $(-8,2)$ and $(-1,4)$: $m=\frac{y_2-y_1}{x_2-x_1}=\frac{4-2}{-1-(-8)}=\frac{2}{7}$ Slope of the line passing through $(0,-4)$ and $(-7,7)$: $m=\frac{y_2-y_1}{x_2-x_1}=\frac{7-(-4)}{-7-0)}=\frac{11}{-7}=-\frac{11}{7}$