1. 4.4 Slope of a Line Slope basically describes the steepness of a line

2. If a line goes up from left to right, then the slope has to be positive Conversely, if a line goes down from left to right, then the slope has to be negative

3. Definitions of Slope Slope is simply the change in the vertical distance over the change in the horizontal distance

4. The formula above is the one which we will use to find the slope of specific lines In order to use that formula we need to know, or be able to find 2 points on the line

5. Formula for Slope A way to remember which value goes on top. 2 Y 1 -Y-Y 2 X 1 - X Keep the pairs together.

6. If a line is in the form Ax + By = C (what is this called??), we can use the following formula to find the slope:

7. Examples

8. Horizontal lines have a slope of zero while vertical lines have no slope HorizontalVertical m = 0 m = no slope

9. horizontal line y What does an upside- down h look like? = any number Is always a horizontal line.

10. Vertical line x What does an upside- down and right-side up V look like? = any number Is always a vertical line.

11. Homework: p. 239-240 #3-27 multiples of 3