1. Lesson 1-2 Slopes of Lines

2. Objective:

3. To find the slope of a line and to determine whether two lines are parallel, perpendicular, or neither.

4. Slope

5. A number measuring the steepness of the line relative to the x-axis.

6. Slope

7. Horizontal lines have a slope of ???

8. Slope Vertical lines have a slope of ???

9. Slope Lines with a positive slope slant ???

10. Slope Lines with a negative slope slant ???

11. Slope The slope of the equation y = mx + k is ???

12. Slope The slope of the equation y = mx + k is ??? This is called slope- intercept form.

13. What are the slope and y – intercept of the line 7x + 13y = 26?

14. Slope What do you know about the slopes of parallel lines?

15. Slope What do you know about the slopes of perpendicular lines?

16. A line l has equation x + 2y = 5. What is the slope of a line (a) parallel to l? (b) perpendicular to l?

17. The equations of three lines are given. Which lines are parallel and which are perpendicular? a. y = ¾ x – 7 b. 4x + 3y = 10 c. 3x – 4y = 11

18. Find the value of k if the line joining (2, k) and (4, 5) and the line y = 3x + 1 are (a) parallel, (b) perpendicular.

19. Assignment: Pgs. 11 - 13 C.E.  1-14 all, W.E.  1-27 odd