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Line a with a slope perpendicular to that of line b has a slope that is the negative reciprocal of line b's. So basically the negative reciprocal.
If a line has a negative slope it is going 'down hill' and if it has a positive slope it is going 'up hill'
The negative reciprocal of the slope of the line to which it is perpendicular.
Negative 0.2
NoIf the slope of a given line is x, than the slope of the line perpendicular to the first line is 1/-x. So if the first slope is negative, the second will be positive, and vice versa.