1. Writing Functions Pg. 249 – 250 #13 – 43(odd)

2. Determine a relationship between the x- and y-values. Write an equation. SWBAT: Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values.

3. Determine a relationship between the x- and y-values. Write an equation. {(1, 3), (2, 6), (3, 9), (4, 12)} SWBAT: Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values.

4. Using a Table to Write an Equation Determine a relationship between the x- and y-values. Write an equation. x y 51015 20 1 2 3 4 SWBAT: Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values.

5. Determine a relationship between the x- and y-values. Write an equation. {(1, 3), (2, 7), (3, 11), (4, 15)} x y 123 4 3 71115 SWBAT: Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values.

6. The equation in Example 1 describes a function because for each x-value (input), there is only one y-value (output). SWBAT: Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values.

7. The input of a function is the ____________ The output of a function is the ___________ The value of the dependent variable depends on, or is a function of, the value of the independent variable. SWBAT: Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values.

8. Helpful Hint There are several different ways to describe the variables of a function. Independent Variable Dependent Variable x-values y-values DomainRange InputOutput xf(x)f(x) SWBAT: Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values.

9. Identifying Independent and Dependent Variables A painter must measure a room before deciding how much paint to buy. The amount of paint depends on the measurement of a room. SWBAT: Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values.

10. The height of a candle decrease d centimeters for every hour it burns. The height of a candle depends on the number of hours it burns. Identifying Independent and Dependent Variables SWBAT: Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values.

11. A company charges $10 per hour to rent a jackhammer. The cost to rent a jackhammer depends on the length of time it is rented. Dependent variable: cost Independent variable: time SWBAT: Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values. Identifying Independent and Dependent Variables

12. The dependent variable is a function of the independent variable. y is a function of x. y = f (x) SWBAT: Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values. An algebraic expression that defines a function is a ___________.

13. Identify the independent and dependent variables. Write a rule in function notation for the situation. A math tutor charges $90 per hour. Writing Functions SWBAT: Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values.

14. A fitness center charges a $100 initiation fee plus $40 per month. Writing Functions Identify the independent and dependent variables. Write a rule in function notation for the situation. SWBAT: Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values.

15. Evaluating Functions Evaluate the function for the given input values. For f(x) = 3x + 2, find f(x) when x = 7 and when x = –4. SWBAT: Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values.

16. Evaluating Functions Evaluate the function for the given input values. For g(t) = 1.5t – 5, find g(t) when t = 6 and when t = –2. SWBAT: Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values.

17. Evaluating Functions Evaluate the function for the given input values. For, find h(r) when r = 600 and when r = –12. SWBAT: Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values.

18. When a function describes a real-world situation, every real number is not always reasonable for the domain and range. For example, a number representing the length of an object cannot be negative, and only whole numbers can represent a number of people.

19. Finding the Reasonable Range and Domain of a Function Joe has enough money to buy 1, 2, or 3 DVDs at $15.00 each. SWBAT: Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values.

20. Substitute the domain values into the function rule to find the range values. SWBAT: Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values.

21. The settings on a space heater are the whole numbers from 0 to 3. The total of watts used for each setting is 500 times the setting number. Write a function rule to describe the number of watts used for each setting. Find a reasonable domain and range for the function. SWBAT: Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values.

22. There are 4 possible settings 0, 1, 2, and 3, so a reasonable domain would be {0, 1, 2, 3}. Example 5 Substitute these values into the function rule to find the range values. SWBAT: Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values.