Question

How do I do the vertical line test

Answer 1

Okay so what you do if you put your pencil on the graph and draw multiple lines through you points, if any of you straight lines go through two points then it does not pass, but your graph in that picture will pass the vertical line test

Answer 2

Ok, so I'm not entirely sure since I haven't done this in a while, but here's a link to help.
http://www.virtualnerd.com/algebra-1/relations-functions/functions/function-notation/identify-differ...
My guess would be, before even reviewing the video, is that it is not. Because it's called a VERTICAL line test it makes me think it may be a function if the points are in a vertical line and not a curve like in the above picture. 
:)
Good luck with your assignment. Message me if you need more help.