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Perpendicular lines
For one line to be perpendicular to another, the relationship between their slopes has to be negative
reciprocal . In other words, the two lines are perpendicular if and only if the product of their slopes is .
The two lines and are perpendicular if .
The equation of a line passing through the point ) and perpendicular to line is:
Example #1
Q: Are the two lines below perpendicular?
Solution:
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GMAT Club Math Book
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