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OpenStudy (anonymous):
is -2y-4x=8 parallel or perpendicular to 2x-y=1
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OpenStudy (anonymous):
In order to tell if a line is parallel/perpendicular to another line, you must compare their slopes. The slopes of two parallel lines will be equivalent, while the slopes of two lines that are perpendicular to each other will be the negative reciprocals of each other, ie. a line with slope m = 2 is perpendicular to a line with slope m = -1/2.
OpenStudy (anonymous):
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