1. 1-6 Relations again Goals:
Identify independent and dependent variables.
Interpret graphs of relations.
Eligible Content:
A / A / A / A

2. Vocabulary
Independent Variable – the variable whose value determines the value of the dependent variable. It is usually the x variable. (domain)
Dependent Variable – the variable whose value is determined by the value of the independent variable. It is usually the y variable. (range)

3. Identify the independent and dependent variable
In warm climates, the average amount of electricity used rises as the daily average temperature increases, and falls as the daily average temperature decreases.
independent: temperature
dependent: electricity used

4. Identify the independent and dependent variable
The number of calories you burn increases as the number of minutes that you walk increases.
independent: minutes of walking
dependent: calories burned

5. Identify the independent and dependent variable
The dance committee is selling tickets to the Fall Ball. The more tickets that they sell, the greater the amount of money they can spend for decorations.
independent: tickets sold
dependent: money spent on decorations

6. Identify the independent and dependent variable
Generally, the average price of going to the movies has steadily increased over time.
independent: time
dependent: price of movie ticket

7. In a particular club, as membership dues increase, the number of new members decreases. Identify the independent and dependent variable in this function.
The number of new members is the independent variable. The dues is the dependent variable.
B. Membership dues is the independent variable. The number of new members is the dependent variable.
C. x is the independent variable. y is the dependent variable.
D. Both variables are independent.

8. The area of a square increases as the length of a side increases
The area of a square increases as the length of a side increases. Identify the independent and dependent variable in this function.
A. The length of the side is independent, and the the area of the square is dependent.
B. The area is independent, and the side length is dependent.
C. Both variables are independent.
D. Both variables are dependent.

9. practice
Page 43 #3-6

10. Interpreting Graphs
The graph represents the temperature in Ms. Ling’s classroom on a winter school day. Describe what is happening in the graph.

11. Interpreting graphs
The graph represents Macy’s speed as she swims laps in a pool. Describe what is happening in the graph.

12. More examples Page 42 in textbook: Example 3 Page 43 #7 & 8
Textbook website examples

13. HOMEWORK
Pages #15-20
#23, 26