If a line on a graph is rising as it goes from left to right, it has a positive slope. If it is falling from left to right (or rising from right to left) it has a negative slope. If it is horizontal, it has a slope of zero.
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I believe they have Negative Slopes as stated by my Geometry Book. "Perpendicular Lines Have Slopes Which Are Negative ___"
perpendiculars("Opposite" is a pretty arbitrary condition in math. The slopes are negative reciprocals.)and by negative that person means the opposite of what it is already, negative or positive, it's not always negative
Yes, as long as the negative slopes are both equal.
If you have two lines that have negative recipricals (1 and -1 for example), the lines are perpendicular.
The slopes are negative reciprocals.