If you mean y = -13x then the slope of the line perpendicular to it is 1/13
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The line perpendicular to a line with a slope of 1/5 has a slope of -5.
The negative reciprocal of the slope of the line to which it is perpendicular.
The slope of a perpendicular line is not defined.
If we call the slope m we can say that the slope of the perpendicular line is -1/m In this case as the slope, m, is 13 the slope of the perpendicular is -1/13 or -0.07692307692
The slope of a line perpendicular to one with slope m is -1/m. So for a line with slope 1/7, any line perpendicular to it will have: slope = -1 / (1/7) = -7