M refers to the modulus of the slope.
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m = slope
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
slope = m = (∆y) / (∆x) = rise / run
It is the slope.
Slope!