My kids are taking a quiz. The question is a table and has the following points: (-1,3)(-1,2)(0,-4) and (4,2). They have to decide if it is a function. I have drilled into them that when you have the same x then it can not be a function. I did the whole vertical line test and all trying to further explain it. Well two sections later we look at tables and work to find the rule of the function . Now they are taking a quiz and the rule part is fresh on their brain the whole if it has the same x has disappeared from their brains (not a proud teacher moment). I had two students call me over and say Mrs. Stanley are you sure this is right? How could -1 equal both 3, and 2? Is there a mistake because you can't do that? Then BAM lightbulb ....student: "OHHHH so it can't be a function because it wouldn't be possible to make a rule for it. I get it now!" All the while I am trying to say shhhh because their lightbulb moment was telling the answer to the rest of the class. I love it when they finally make the connections.
