Use the formula for slope:
For any two points [tex](x_1,\ y_1)[/tex] and [tex](x_2,\ y_2}[/tex], the slope m...
[tex]m=\frac{rise}{run}=\frac{y_2-y_1}{x_2-x_1}[/tex]
With our point values here...
[tex]m=\frac{7-(-6)}{11-17}=\frac{7+6}{-6}=\boxed{-\frac{13}6}[/tex]
