**Station A Answers**

1. It is a function because each input has only one output.

2. It is not a function because -1 has two different outputs.

3. It is not a function because it fails the vertical line test.

4. It is a function because each input has only one output.

5. It is not a function because it fails the vertical line test. Points F and E are on the same vertical line.

6. It is not a function because 2 has multiple output values.

7. It is a function because each input has only one output.

8. It is a function because it passes the vertical line test.

9. It is a function because each input has only one output. Even though -3 shows up as an input twice, it still gives the same output each time.