Hi,

I'm a college student with an college level Intermediate Algebra question:

Which are the following are not functions?

1. y = x²
   
   
2. y = x³
   
   
3. x = y²
   
   
4. y = 3

Your help is greatly appreciated.

Thank you,
Christian

Hi Christian,

Try graphing these relations and applying the vertical line test. Imagine a series of vertical lines superimposed over the graphs. If any of these vertical lines goes through the graph more than once, it is not a function. If each vertical line goes through the graph at most once, it is a function.

Hope this helps,

Leeanne