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Algebra 25 Online
OpenStudy (anonymous):

what is the slope of a line perpendicular to a line that passes through (3 8) and (1 -4)

OpenStudy (radar):

The slope of a line perpendicular to the line that has those two points will be the negative reciprocal of that line (the one with the two points). Your best bet would be first to calculate the slope of the line that passes thru (3,8) and 1,-4). What do you get for that slope?

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