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.