## Introductory Algebra for College Students (7th Edition)

$$m = 0$$ Because the slope is zero, the line is horizontal.
To find the slope, we use the formula: $$m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}}$$ We now plug in the given points into this equation to find the slope of this line: $$m = \frac{4 - 4}{6 - (-3)}$$ Simplify: $$m = \frac{0}{9}$$ $$m = 0$$ Because the slope is zero, the line is horizontal.