1. Section 3-6: Slopes of Parallel and Perpendicular Lines Goal 2.02: Apply properties, definitions, and theorems of angles and lines to solve problems and write proofs.

2. Check Homework: Worksheet Writing Linear Equations Lesson Quiz 3 – 5

3. Essential Question How is slope used to identify parallel and perpendicular lines?

4. Slopes of Parallel Lines Slopes of Perpendicular Lines

5. Using linear equations how do we decide if lines are parallel, perpendicular, or neither?

6. Step 1: Find the slope of each line. Step 2: Compare the two slopes. Slopes are =, lines are parallel Slopes are opposite reciprocals, lines are perpendicular

7. Together: p 161 6. 7. 8 9 10 11

8. P 162 25 26 27 28 29 30

9. Group Practice With Partner: practice 3-6: Do # 3 – 21 (multiples of 3) Individual Practice: Worksheet: Slope: Parallel and Perpendicular Lines

10. Summarize: Ticket out the door List the standard form, point-slope and slope- intercept form of a linear equation. (no notes) Also answer Essential Question. Homework: Complete Practice 3-6