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Slope of a line = m slope of perpendicular line = -1/m
The slope of a line perpendicular to one with a slope of m is -1/m.
negative 1
Equation of given line: 3x + y = 15 or y = -3x + 15 Slope of given line = coefficient of x = -3 Slope of perperndicular = -1/(slope of given line) = -1 / (-3) = 1/3
x-3y = 9 -3y = -x+9 y = 1/3x -3 Perpendicular slope = -3