1. Warm Up

2. FUNCTIONS DEFINED Essential Question: How can you determine if a relation is a function?

3. Key Terms Function: A relation where for every Input there is exactly ONE Output. Relation: A set or group of Ordered Pairs. Domain: The X-values or Input. Range: The Y-values or Output.

4. How can you tell if a Relation is a Function? XY 12 35 61 For every X-value there is only 1 Y-value. A relation is NOT a function if an X-Value has 2 or more Y- Values. Domain:Range:

5. NOT a Function X134673 Y245796 Domain:Range:

6. Determining if a Graph is a Function A graph is a function if it passes the Vertical Line Test. If a vertical line is drawn anywhere on the coordinate plane, it should only touch the “function” once. Domain: Range:

7. NOT a Function Domain:Range:

8. Examples for Tickets

9. Function or Not a Function? X Y 2 -4 3 0 4 5

10. Function or Not a Function? Domain and Range X Y­­__ 3 4 2 0 1 7

11. Function or Not a Function?

12. Function or Not a Function? Domain and Range

13. Function or Not a Function?