1. In your math notebook find the value of x so that the lines are parallel.

2. Find and use slopes on lines:

3. The slope of a nonvertical line is the ratio of vertical change (rise) to horizontal change (run) between any two points on the line.

4. Find and use slopes on lines: The slope of a nonvertical line is the ratio of vertical change (rise) to horizontal change (run) between any two points on the line.

5. Find and use slopes on lines: Negative slope:

6. Find and use slopes on lines: Negative slope: Falls from the left to right.

7. Find and use slopes on lines: Negative slope: Falls from the left to right.

8. Find and use slopes on lines: Positive slope:

9. Find and use slopes on lines: Positive slope: Rises from left to right.

10. Find and use slopes on lines: Positive slope: Rises from left to right.

11. Find and use slopes on lines: Zero slope (slope of 0):

12. Find and use slopes on lines: Zero slope (slope of 0): Horizontal line.

13. Find and use slopes on lines: Zero slope (slope of 0): Horizontal line.

14. Find and use slopes on lines: Undefined slope:

15. Find and use slopes on lines: Undefined slope: Vertical line.

16. Find and use slopes on lines: Undefined slope: Vertical line.

17. Find and use slopes on lines: Find the slope of any line by using two points and the equation for M.

18. Find and use slopes on lines: Find the slope of A Find the slope of B Find the slope of C

19. Find and use slopes on lines: Find the slope of A Find the slope of B What do you notice about the slopes of A and B?

20. Find and use slopes on lines: Find the slope of A Find the slope of B What do you notice about the slopes of A and B? Parallel lines have the same slope.

21. Find and use slopes on lines: Find the slope of A Find the slope of B What do you notice about the slopes of A and B?

22. Find and use slopes on lines: Find the slope of A Find the slope of B What do you notice about the slopes of A and B? Perpendicular lines have negative inverse slopes.

23. Find and use slopes on lines: Find the slope of A Find the slope of B What do you notice about the slopes of A and B? Perpendicular lines have negative inverse slopes. Negative inverse means opposite signs and flipped.

24. Find and use slopes on lines: What kind of slope does each line have? A = B= C= D=

25. Find and use slopes on lines: Tell whether the liens through the given points are parallel, perpendicular, or neither. Line 1: (1,0), (7,4) Line 2: (7,0), (3,6) Line 1: (-3,1), (-7,-2) Line 2: (2,-1), (8,4)