Can someone please help me with my Imagine Math? My teacher assigned are class to do this even though we haven't learned about this yet.... I don't understand this at All!

QUESTION:
Drag each graph to show whether it is a function of x or not a function of x. If there is not enough information to tell, drag the graph into the box under “Not Enough Information.”

When you tell me the answers type it in this format:
this graph goes in "function" OR this graph goes in "Not a function" OR this graph goes in "Not enough information"