The slope of a line perpendicular to one with a slope of m is -1/m.
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Slope of a line = m slope of perpendicular line = -1/m
Given any line L, with slope m, the perpendicular line has slope -m.
Slope: (2-4)/(0--3) = -2/3 Perpendicular slope: 3/2
Points: (5, -1) and (2, -5) Slope: 4/3 Perpendicular slope: -3/4
The line y = 2x If you put it into the form y = mx + b, you have y = 2x + 0 so the slope is 2. Lines parallel to that line have the same slope, 2. Perpendicular lines have slopes that multiply to -1. The slope of a perpendicular line to a line of slope 2 would be -1/2.