Two lines with opposite reciprocal slopes form perpendicular lines.
Question
Two lines with opposite reciprocal slopes form perpendicular lines.
Solution
Yes, that's correct. Two lines are perpendicular if and only if the product of their slopes is -1. In other words, if m1 and m2 are the slopes of two lines, then these lines are perpendicular if m1*m2 = -1. This is equivalent to saying that the slopes are negative reciprocals of each other. For example, if the slope of one line is 2, the slope of a line perpendicular to it would be -1/2.
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