If a line has a negative slope it is going 'down hill' and if it has a positive slope it is going 'up hill'
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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.
The negative reciprocal of the slope of the line to which it is perpendicular.
If you mean a slope of -1 then it is: y = -x+5
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.