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The slope of parallel lines are the same, but the slope of perpendicular lines are negative reciprocals of each other.
larger slope if positive and a smaller slope if negative
one slope is the negative reciprocal of the other
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.
Perpendicular lines have a negative reciprocal slope. Slope of y=2x+5 is 2/1 negative reciprocal is (-1/2)