Answer
0
Work Step by Step
Find two points that lie on the line: ($\frac{-1}{2}$,$\frac{4}{7}$ ) (8,$\frac{4}{7}$)
Use the slope equation:
$\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$
You will get:
$\frac{\frac{4}{7}-\frac{4}{7}}{-\frac{1}{2}-8}$
The answer is $0$.