1. Warmup – 8/23 Solve the following equations for y: -6x + 2y = 18

2. Goal:
I will be able to explain in words what a function is and identify and sketch the graphs of the seven parent functions we will study in Algebra 2.

3. What is a relation?
A relation is simply a set of ordered pairs. The first elements in the ordered pairs (the x-values), form the domain. The second elements in the ordered pairs (the y-values), form the range.

4. Definition of a Function
A function is a relation in which each element of the domain is paired with exactly one element of the range.

5. What does that mean?
Domain
Range
Input
Output
Independent Variable
Dependent Variable
X-Values
Y-Values

6. How does a function work?

7. How does a function work?
Input
Output
Button 1
Coke
Button 2
Button 3
Sprite
Button 4
Diet Coke
Button 5
Mr. Pibb
Button 6
Mellow Yellow
Button 7
Caffeine Free Coke
Button 8
Root Beer

8. Are the following relations functions?

9. On Your Whiteboard:
Write two relations. One that is an example of a function and one that is not an example of a relation. Your example must be different than your neighbor.

10. Do the following graphs represent a function?

11. Exit Ticket:
In your own words, explain how to determine if a relation is also a function. Be sure to include the terms domain and range in your description.