1. Concept

2. Example 1 Find Rate of Change DRIVING TIME Use the table to find the rate of change. Explain the meaning of the rate of change.

3. Example 1 CELL PHONE The table shows how the cost changes with the number of minutes used. Use the table to find the rate of change. Explain the meaning of the rate of change.

4. Example 2 A Variable Rate of Change A. TRAVEL The graph to the right shows the number of U.S. passports issued in 2002, 2004, and 2006. Find the rates of change for 2002–2004 and 2004–2006. millions of passports years

5. Example 2 CYP A A. Airlines The graph shows the number of airplane departures in the United States in recent years. Find the rates of change for 1995–2000 and 2000–2005.

6. Example 3 A Constant Rate of Change A. Determine whether the function is linear. Explain.

7. Example 3 CYP A A. Determine whether the function is linear. Explain.

8. Concept

9. Example 4 A Positive, Negative, and Zero Slope A. Find the slope of the line that passes through (–3, 2) and (5, 5). Let (–3, 2) = (x 1, y 1 ) and (5, 5) = (x 2, y 2 ). Substitute. Answer: Simplify.

10. Example 4 CYP A A. Find the slope of the line that passes through (4, 5) and (7, 6).

11. Concept