1. Four Faces of a Linear Function
Saving for an iPhone

2. Today we will… Define Linear Relationship
Discuss the Four Faces of a Linear Function
Summarize the iPhone Investigation

3. Definition of a Linear Relationship
Comparison of two variables that change at constant rates.
Definition of a Linear Relationship

4. Four Faces of a Linear Function
Table
Graph
Equation
Story Problem

5. Table

6. Graph

7. Equation

8. Story Problem

9. How can we see a linear relationship in each of the four faces of a function?
Table ~ both the independent and dependent variables will increase or decrease at a constant rate
Graph ~ line (Linear)
Equation ~ will be in the form of y = mx + b; the equation will be in the first degree
Story Problem ~ will contain a constant; look for the word “per” in the story problem