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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
- Addition, Susan R. Rodgers, Dawn Baker-Ingram