The slope of a perpendicular line is not defined.
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It could be referring to a perpendicular line
If you are asking for slope, the slope of one line is m, the slope of the other is -1/m. For example, if the slope for one line is 5, the slope of the other line is -1/5 = -0.2 . (Math Open Reference)
(I am going to assume you are higher or in grade 9 math) So use the y=mx + b Use the negative reciprocal of the "m"(slope) part. Do this by simply flipping the fraction. This slope will be perpendicular to the original formula.
Since the inverse of a function is it's reflection over the line x=y, which has a slope of 1. The only way a function can be It'a own inverse is if it is a liner function whose slope is perpendicular to the line. Since a perpendicular line is any line with the negative recoprocal of the slope, any linear function whose slope is -1 will be it's own inverse. - stefanie math 7-12 teacher
gradient in math refers to the slope of a line