Find parallel and perpendicular slopes
Perpendicular slopes are negative reciprocals; parallel slopes are equal.
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A line is perpendicular to y = −x − 10. What is its slope?
Answer: 1
A line is perpendicular to y = 3x − 9. What is its slope?
Answer: -1/3
A line is perpendicular to y = 3x. What is its slope?
Answer: -1/3
Tip: Perpendicular slopes are negative reciprocals; parallel slopes are equal.
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