3-3 Writing FunctionsWriting Functions

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Warm Up Lesson Presentation Lesson Quiz

HHoollttAMlgceDboruag1al Algebra 1

3-3 Writing Functions

Warm Up

Evaluate each expression for a = 2, b = ?3, and c = 8. 1. a + 3c 26

2. ab ? c ?14

3.

1 2

c

+

b

1

4. 4c ? b 35

5. ba + c 17

Holt McDougal Algebra 1

3-3 Writing Functions

Objectives

Identify independent and dependent variables. Write an equation in function notation and evaluate a function for given input values.

Holt McDougal Algebra 1

3-3 Writing Functions

Vocabulary

independent variable dependent variable function rule function notation

Holt McDougal Algebra 1

3-3 Writing Functions

Example 1: Using a Table to Write an Equation Determine a relationship between the x- and y-values. Write an equation.

x 5 10 15 20 y1 2 3 4

Step 1 List possible relationships between the first x or y-values. 5 ? 4 = 1 or

Holt McDougal Algebra 1

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