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Mathematics 18 Online
OpenStudy (anonymous):

The slope of any line perpendicular to AB where A(0, -3) and B(4, 9) are two points on the line, is m =

OpenStudy (anonymous):

-3 3 -1/3

Directrix (directrix):

Find the slope of line AB. Perpendicular lines have slopes that multiply to NEGATIVE one. Whatever the slope of line AB, get the negative reciprocal of it for the slope of any line perpendicular to it. @autumnpoteet

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