1. Class Work: Algebra Parallel & Perpendicular Lines You need your notes. Title the notes: Parallel & Perpendicular Lines I will check your work at the end of class.

2. Parallel & Perpendicular Lines Calculate the slope of each line (fraction form). A C D B

3. Parallel Lines A C D B What kind of lines are A & B? What do you notice about their slopes? Parallel lines Same slope

4. Perpendicular Lines A C D B What kind of lines are A & D? What do you notice about their slopes? Perpendicular lines Reciprocal slope with opposite sign

5. Intersecting Lines A C D B What kind of lines are B & C? Intersecting lines There is nothing special about the slopes of intersecting lines.

6. Parallel & Perpendicular Lines Parallel lines: same slope Perpendicular lines: opposite reciprocal slope Identify the type of lines: Perpendicular lines: the slopes are opposite reciprocals

7. Parallel & Perpendicular Lines Identify the type of lines: Parallel lines: the slopes are the same Perpendicular lines: the slopes are opposite reciprocals

8. Class Work: Algebra Identify the type of lines: 1. 2. 3. 4. 5.Write an equation of a line parallel to: 6.Write an equation of a line perpendicular to: