Question 631686: Is the relation {(–2, 5), (–1, 5), (–1, 4), (–1, –3), (–2, 0)} a function?
Answer by nerdybill(7384)   (Show Source):
You can put this solution on YOUR website! Is the relation {(–2, 5), (–1, 5), (–1, 4), (–1, –3), (–2, 0)} a function?
NO
Because when x=-1, there are THREE different values of y's
and, when x=-2 there are TWO different values of y's
this breaks the "vertical line test"
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