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

m=$\frac{y_2-y_1}{x_2-x_1}$ m=$\frac{-2-(-2)}{3-4}$ m=$\frac{-2+2}{-1}$ m=$\frac{0}{-1}$ m=0 The slope is 0 so the line is horizontal.