# 4-3 Rate of Change and Slope. Warm Up. 1. Find the x- and y-intercepts of 2x 5y = 20. Describe the correlation shown by the scatter plot. 2.

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1 Warm Up 1. Find the x- and y-intercepts of 2x 5y = 20. Describe the correlation shown by the scatter plot. 2.

2 Objectives Find rates of change and slopes. Relate a constant rate of change to the slope of a line.

3 rate of change rise run slope Vocabulary

4 A rate of change is a ratio that compares the amount of change in a dependent variable to the amount of change in an independent variable.

5 Example 1: Application The table shows the average temperature ( F) for five months in a certain city. Find the rate of change for each time period. During which time period did the temperature increase at the fastest rate? Step 1 Identify the dependent and independent variables. dependent: temperature independent: month

6 Example 1 Continued Step 2 Find the rates of change. 2 to 3 3 to 5 5 to 7 7 to 8 The temperature increased at the greatest rate from month 5 to month 7.

7 Check It Out! Example 1 The table shows the balance of a bank account on different days of the month. Find the rate of change during each time interval. During which time interval did the balance decrease at the greatest rate? Step 1 Identify the dependent and independent variables. dependent: balance independent: day

8 1 to 6 Check It Out! Example 1 Continued Step 2 Find the rates of change. 6 to to to 30 The balance declined at the greatest rate from day 1 to day 6.

9 Example 2: Finding Rates of Change from a Graph Graph the data from Example 1 and show the rates of change. Graph the ordered pairs. The vertical segments show the changes in the dependent variable, and the horizontal segments show the changes in the independent variable. Notice that the greatest rate of change is represented by the steepest of the red line segments.

10 Example 2 Continued Graph the data from Example 1 and show the rates of change. Also notice that between months 2 to 3, when the balance did not change, the line segment is horizontal.

11 If all of the connected segments have the same rate of change, then they all have the same steepness and together form a straight line. The constant rate of change of a line is called the slope of the line.

12

13 Example 3: Finding Slope Find the slope of the line. Rise 3 ( 6, 5) Run 9 Run 9 Rise 3 (3, 2) Begin at one point and count vertically to fine the rise. Then count horizontally to the second point to find the run. It does not matter which point you start with. The slope is the same.

14 Check It Out! Example 3 Find the slope of the line that contains (0, 3) and (5, 5). Begin at one point and count vertically to find rise. Then count horizontally to the second point to find the run. Rise 2 Run 5 It does not matter which point you start with. The slope is Rise 2 the same. Run 5

15 Example 4: Finding Slopes of Horizontal and Vertical Lines Find the slope of each line. A. B. You cannot divide by 0 The slope is undefined. The slope is 0.

16 Check It Out! Example 4 Find the slope of each line. 4a. 4b. You cannot divide by 0. The slope is undefined. The slope is 0.

17 As shown in the previous examples, slope can be positive, negative, zero or undefined. You can tell which of these is the case by looking at a graph of a line you do not need to calculate the slope.

18 Example 5: Describing Slope Tell whether the slope of each line is positive, negative, zero or undefined. A. B. The line rises from left to right. The slope is positive. The line falls from left to right. The slope is negative.

19 Check It Out! Example 5 Tell whether the slope of each line is positive, negative, zero or undefined. a. b. The line is vertical. The slope is undefined. The line rises from left to right. The slope is positive.

20

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