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Mathematics 21 Online
OpenStudy (anonymous):

Help- Which equasion show a line that is PARALLEL and a line that is PERPENDICULAR

OpenStudy (anonymous):

If they form 90 degree angles, and the slope is the negative reciprocal ( ex: 1/2 and -2 are negative reciprocals) they're perpendicular. If they never intersect and have the same slope, they are parallel.

OpenStudy (anonymous):

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