1. Is it a Function?
Teacher Twins©2014

2. Warm Up D= {2,3,5} R= {3,4,6} D= {-2,-3,4} R= {-6,0,3,5}

3. Is it a Function?

4. A set of ordered pairs is called a relation.
A function is a set of ordered pairs where each input or domain value, has exactly one output or range value.
A set of ordered pairs is called a relation.

5. Ex 1:
Function- It has one output for each input.

6. Ex 2:
Not a Function- The input of 1 has two different outputs.

8. Ex 3: Is the relation a function ?
It passes the vertical line test so this is a function.

9. No, it does not pass the vertical line test.
Ex 4: Is the relation a function?
No, it does not pass the vertical line test.

10. Yes, it passes the vertical line test.
Ex 5: Is the relation a function?
Yes, it passes the vertical line test.

11. Practice
Is it a function?
yes
yes

12. Closure
How can you tell if a relation is a function when you have a set of ordered pairs? When you have a graph?