1. The document defines parallel and perpendicular lines and discusses identifying the slope and y-intercept of lines. It provides examples of finding the slope and y-intercept of lines in slope-intercept form and writing equations of parallel lines. 2. Students are given practice problems to find the slope and y-intercept of lines in various forms and to write equations of parallel lines passing through given points. 3. The key concepts covered are identifying slope and y-intercept, writing equations in slope-intercept form, determining if lines are parallel based on having the same slope, and writing equations of parallel lines.

1. Bell Ringer Simplify each fraction. 1. 4 – 3 -2 – 9 2. -3 + 12 8 – (-2) 3. 7 + -2 15 - 10

2. Definitions Parallel Lines - lines that never intersect Perpendicular Lines - lines that intersect to form 90° angles Skew Lines - Lines that are not in the same plane and do not intersect

3. Identifying Slope and Y - Intercept y = m x + b slope y - intercept

4. Identifying Slope and Y - Intercept Find the slope and y – intercept of each. y = 2x + 3 y = -3x – 9 y = x + ½ -y = 2x

5. You try! Find the slope and y – intercept of each. y = 5x + ¼ y = -x + 12 y = x - 3 -y = x + 9

6. Slope Intercept Form Solve each equation for y then find m and b. 2x + y = 6 9 – y = 2x 12 + 2y = 8x -3y + 9 = 12x

7. You try 2! Solve each equation for y then find m and b. 2x + y = 6 9 – y = 2x 12 + 2y = 8x -3y + 9 = 12x

8. Parallel Lines - Two lines are parallel if they have the same slope. Write an equation of a line parallel that passes through the following point: m = 2, (-1, 4)

9. 2. m = ½, (2, -3) 3. m = 1, (0, 6)

10. You try 3! Find a line parallel that passes thru each point. m = 5, (-2, -8) m = 2.5, (8, 4) m = -3, (3, -4)