This is similar to Problem 3 from your Section 4.1 worksheet.

Determine whether the following graphs represent as a function of In each graph, the -axis is horizontal and the -axis is vertical.

** 1. ** Does the graph represent a function of ?

** 2. ** Does the graph represent a function of ?

** 3. ** Does the graph represent a function of ?

** 4. ** Does the graph represent a function of ?

** Note: ** * You can click on the graphs to enlarge the images.*

** Note:** * You only have three attempts at this problem.*