1. Sec 4.5: Slope Formula

2. Objectives To learn what slope is
To learn how to find the slope given 2 point
To learn how to find the slope of a table

3. Concept: What is Slope? Slope is the rate of change of a line.
It represents the steepness of a line.
(change in y)
(change in x)

4. Concept: Using Slope Formula
1. (9, 2), (8, -7) X1 y1 X2 y2
2. (-4, 4), (-7, 2) y1 X2 X1 y2
3. (5, -1), (9, -4) X1 y1 y2 X2

5. Concept: Using Slope Formula cont…
4. (5, 2), (1, 0) X1 y1 X2 y2
5. (3, -3), (3, -1) y1 X2 X1 y2
Undefined
6. (-4, -2), (4, -2) X1 y1 y2 X2

6. Concept: Slope From a Table
In a table we can use the same formula. Pick any two pairs in the table for coordinates
Pick any two rows.
If it is linear it will be the same
no matter which two rows you pick x y -4
-17 1 -2 3 4 8 19 10 25 x1 y1 x2 y2

7. Concept: Slope From a Table cont..
Find the slope for each table below x y
-10 17 -5 10 -1
4.4 5 -4
-11 x y -3 -8 -1 1 4

8. Conclusion Slope is: Describe the slope of each of the following
the rate of change of a line
Negative slope
Undefined
Positive slope
Zero/0 slope