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Unformatted text preview: reciprocals that equal 1. For example, if the first line has the slope of ¾ and the second line has a slope of 4/3, then the two line would be perpendicular. If you multiply ¾ and 4/3 straight across like so 3/4 * 4/3 = 1, thus the two lines are perpendicular....
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 Spring '09
 GEORGEGREAVES
 Addition, Susan R. Rodgers, Dawn BakerIngram

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