1. Holt Algebra 1 65 Slopes of Parallel and Perpendicular Lines Warm Up Find the reciprocal. 1. 2 2. 3. Find the slope of the line that passes through each pair of points. 4. (2, 2) and (–1, 3) 5. (3, 4) and (4, 6) 6. (5, 1) and (0, 0)

2. Holt Algebra 1 65 Slopes of Parallel and Perpendicular Lines Identify and graph parallel and perpendicular lines. Write equations to describe lines parallel or perpendicular to a given line. Learning Targets

3. Holt Algebra 1 65 Slopes of Parallel and Perpendicular Lines

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5. Holt Algebra 1 65 Slopes of Parallel and Perpendicular Lines

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7. Holt Algebra 1 65 Slopes of Parallel and Perpendicular Lines

8. Holt Algebra 1 65 Slopes of Parallel and Perpendicular Lines

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10. Holt Algebra 1 65 Slopes of Parallel and Perpendicular Lines

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12. Holt Algebra 1 65 Slopes of Parallel and Perpendicular Lines

13. Holt Algebra 1 65 Slopes of Parallel and Perpendicular Lines http://my.hrw.com/math11/math06_07/nsmedia/lesso n_videos/alg1/player.html?contentSrc=7521/7521.xml AB is parallel to CD because ___________________ AD is parallel to BC because ___________________ Slope BC = ________ Slope AD = ________

14. Holt Algebra 1 65 Slopes of Parallel and Perpendicular Lines

15. Holt Algebra 1 65 Slopes of Parallel and Perpendicular Lines

16. Holt Algebra 1 65 Slopes of Parallel and Perpendicular Lines Lesson Quiz: Part I Write an equation is slope-intercept form for the line described. 1. contains the point (8, –12) and is parallel to 2. contains the point (4, –3) and is perpendicular to y = 4x + 5

17. Holt Algebra 1 65 Slopes of Parallel and Perpendicular Lines Lesson Quiz: Part II 3. Show that WXYZ is a rectangle.