1 Lines Slope The slope of a line is the ratio of the vertical change to the horizontal change between any two points on the line. Here (x1 y1) and (x2 y2) are two points on the line. Example 1 Find the slope of the line that contains the points (- 5 3) and (4 0). Here x1 - 5 y1 3 x2 4 and y2 0. 2 Lines Slope Example 2 Find the slope of the line that contains the points (- 1 3) and (- 1 - 2). 2 3 Lines Slope In example two the slope was found to be undefined. Here the two points lie on a vertical line. Facts About Special Lines The slope of a vertical line is undefined. The slope of a horizontal line is zero. Parallel lines have the same slope. Perpendicular lines slopes that are opposite in sign and reciprocals of each other. 3 4 Lines Slope END OF PRESENTATION Click to rerun theshow.
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