Presentation on theme: "Lesson 6.5 Parallel and Perpendicular Lines"— Presentation transcript:
1 Lesson 6.5 Parallel and Perpendicular Lines Objective: To determine whether lines are parallel or perpendicular.
2 Check Skills You’ll Need What is the reciprocal of each fraction?4/3-2/5-7/51 2/3
3 Check Skills You’ll Need (continue) What are the slope and y-intercepts of each equation?y = 5/3x + 4y = 5/3 x – 8y = 6xy = 6x + 2y = -1/4x -1y = 4x + 2
4 VocabularyParallel lines are lines in the same plane that never intersect. Nonvertical lines are parallel if they have the same slope and different y-intercepts. Any two vertical lines are parallel.Perpendicular lines are lines that intersect to form right angles. Two lines are perpendicular if the product of their slopes is -1. A vertical and a horizontal line are also perpendicular. The product of two numbers is -1 if one number is the negative reciprocal of the other.