Perpendicular Lines in the Coordinate Plane

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Presentation transcript:

Perpendicular Lines in the Coordinate Plane Chapter 3 Section 3.7 Perpendicular Lines in the Coordinate Plane

Warm-Up Line m is perpendicular to line n. If line m has a positive slope, what kind of slope does line n have? A negative slope Find the slope of the line that passes through the points (5, 6) and (-9, 0). (0-6)/(-9-5) = -6/-14 = 3/7

How Are Perpendicular Lines Related? Postulate 18: The product of their slopes is –1. Vertical and horizontal lines are perpendicular Determine if the lines are perpendicular The product of the slopes = -1, thus

The Slopes of Two Lines Are Given. Are They Perpendicular? Lines are not  Lines are 

Decide Whether p1 and p2 are Perpendicular p1 is not  to p2

Decide Whether p1 or p2 Are Perpendicular Yes, p1  p2

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