Date:        6/23/08
Period:      1st-2nd-3rd-4th
Teacher:    Mr. Nastrom
Time:        50 minutes

A.    OBJECTIVE

Apply concepts of functions to identify how a change in the independent variable affects the dependent variable. (Algebra I - 2d, DOK2)

B.    MATERIALS

dry erase markers; dry eraser; pencils & paper; transparencies; Algebra I, Concepts and Applications (2001), Foster et al.

C.    BELL-RINGER

For every $10 you spend at WalMart, you receive a coupon for $0.20 off anything in the store.  How much must you spend to accumulate enough coupons to buy a DVD for $9.99?

D.    SET

"You Say, I Say" using: y = 4x,   y = 3x -2,    y = |x| - 4

E.    PROCEDURES

1.    First thing to do . . .
    
Review the terms related to functions: ordered pair, relation, function. 

Define independent and dependent variables.  (The value of the dependent variable depends on the value of the independent variable.) 

Example: To prevent overproduction, the government gives farmers $500.00 for every acre of farmland not planted with corn, cotton, wheat, or soybeans.  How much will a farmer in Marshall County receive if the farmer has 1,000 acres of farmland?  [Answer: It depends on how many acres he doesn't plant.]  Which is the dependent variable, dollars of acres?

Example: Lebron James signs a new contract guaranteeing him $15,000,000 annual salary plus a commission of $3,000 for every point he scores.  How much money does he earn in the first year of the contract?  [Answer: It depends on how many points he scores.]  Which is the dependent variable, points or dollars?

In each of the examples, what is the rule -- the function -- that describes what's happening?

2.    Guided practice (write on board before class starts)

Take 5-6 minutes to write a scenario involving a dependent and independent variable.  When you finish, we'll discuss each other's example.

3.    Independent practice (if time)

p.395, #22-25

F.    ASSESSMENT

Informal: Teacher will monitor individual students’ work on in-class guided practice activity and provide assistance as necessary.
Formal: Students will be assessed in a quiz given 6/23/08, and grade will be recorded in book.

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