That it descends.
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If the line slants up and to the right, it has a positive slope. If it is slanting up and to the left, it has a negative slope.
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.
A slope is positive or negative based on if the line goes from the upper left corner down to the lower right corner or right to left. Left is positive right is negative.