Unformatted text preview: For example, the lines (x = 5) and (y = 3) are perpendicular. Otherwise, how can we tell whether two lines are perpendicular? Consider a line AB with slope a/b. Then think of rotating the line 90 degrees to get a line A1B1 perpendicular to AB. For the new line, the rise and the run are interchanged, but the run is now negative. Thus the slope of the new line is –b/a, which is the opposite of the reciprocal of the slope of the first line. Also note that when we multiply the slopes we get 1. a/b (b/a) = 1...
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 Spring '09
 UniversityofPhoenix
 Algebra, Addition, Slope, 90 degrees

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