Algebra 1 Companion Book, Vol 1 – Summer Edition

5.1.3 Rate of Change and Slope (continued) Example 4 Finding Slopes of Horizontal and Vertical Lines

The slope of any horizontal line is 0 because the rise between any two points on a horizontal line is always 0.The slope of any vertical line is undefined because the run between any two points on a vertical line is always 0.

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