1. 3.4 Find and use Slope of Lines

2. Slope Slope is: Rate of change A ratio of rise and run The change in Y over the change in X The m is Y = mX +b

3. How do I find slope

4. Slopes of lines Negative = Falls from left to right Positive = Rises from left to right Zero = horizontal Undefined = vertical, leaning neither positive or negative

5. How do we find slope Count rise over run Use the slope formula Look at the “m” in Y = mX + b

6. Slopes of Parallel Lines Parallel lines will have same slope Y = 3x + 8 and y = 3x - 4 are parallel (same slope)

7. Slope of Perpendicular lines Perpendicular lines will have slopes that are negative reciprocals ( multiply to -1) Vertical and horizontal lines are perpendicular

8. Calculating Slope Given Two Points Take the difference of the y values over the difference in the X values

9. Examples What is the slope?

10. Example What is the slope?

11. Example What is the slope

12. Example What is the slope?

13. Example Find the slope

14. Find slope given two points