Question 870522
Notice how we have the two points (3,5) and (3,4). This x value (x = 3) corresponds to two y values (y = 5, y = 4). So that means it's NOT a function. Each x value must correspond to EXACTLY ONE y value for it to be a function.



Visually, you can plot all of these points. Then you would see that they fail the vertical line test because a vertical line passes through more than one point when you get to (3,5) and (3,4).


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Question: <font color="blue">Is this a function? 
(3,5) (-2,4) (9,1) (7,5) (1,1) (3,4)</font>


Answer: <font color="red">No, it's not a function</font> (reasoning explained above)