one is the negative reciprocal of the other; that is if the slope of one line is 2, the other is -1/2
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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.
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.
They are perpendicular if their slopes are mutual negative reciprocals.
Are perpendicular to one another.
Yes, as long as the negative slopes are both equal.