tkhunny Moderator Staff member Joined Apr 12, 2005 Messages 11,325 Dec 16, 2020 #2 Ever hear of the "Vertical Line Test"? It fails. If you pick one x-value, can you get more than one y-value?
Ever hear of the "Vertical Line Test"? It fails. If you pick one x-value, can you get more than one y-value?
