One is the negative reciprocal of the other. That is, the product of the two slopes is -1. UNLESS one of them is zero, in which case the slope of the other is infinite.
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I believe they have Negative Slopes as stated by my Geometry Book. "Perpendicular Lines Have Slopes Which Are Negative ___"
Take any two lines and look at their slopes. -- If the slopes are equal, then the lines are parallel. -- If the product of the slopes is -1, then the lines are perpendicular.
You have to know the slopes of both lines. -- Take the two slopes. -- The lines are perpendicular if (one slope) = -1/(the other slope), or the product of the slopes equals to -1.
Yes, this can be considered the definition of perpendicular lines (or alternately, the definition of angular measurement). Perpendicular lines are lines that form an angle of 90 degrees.Yes, this can be considered the definition of perpendicular lines (or alternately, the definition of angular measurement). Perpendicular lines are lines that form an angle of 90 degrees.Yes, this can be considered the definition of perpendicular lines (or alternately, the definition of angular measurement). Perpendicular lines are lines that form an angle of 90 degrees.Yes, this can be considered the definition of perpendicular lines (or alternately, the definition of angular measurement). Perpendicular lines are lines that form an angle of 90 degrees.
There is no relationship between the slopes of parallel or perpendicular lines and their y-intercepts.