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Algebra 9 Online
OpenStudy (anonymous):

The slope of a line is -1/2. What is the slope of a line that is perpendicular to it? A.1/2 B.2 C.-1/2 D.-2

OpenStudy (anonymous):

The product of the slopes of perpendicular lines is -1. So you have to find a number which when multiplied with -1/2, gives you -1.

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