Determine if graphs of functions

Question

Determine if the following curves are graphs of functions: 

 

x=2

 

          l  l

          l  l 

_____ l_l_____  (graph is one vertical line to the right of the origion) I tried to mimic picture

          l  l

          l  l 

          l  l

 

 

 

Answer 1

A graph that passes the Vertical Line test is a function. A vertical line fails that test.