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A line does not have an inverse!
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
The slope of an inverse relationship
The slope a graph's line is both a qualitative and quantitative indicator. Based on slope inverse, direct, or null relationships can be observed and even quantified through algebraic expressions. The elementary formula for the slope of a line is rise divided by run or (Y2-Y1)/(X2-X1).
the slope of a line = the Change in Y divided by the Change in X