give an example of 4 ordered pairs that does not model a function. The domain will be any four integers between 0 and +10. The range will be any four integers between -1 and +. Why does this not model a function
You didn't tell us what the largest number in the range can be. You just have
a + sign there. I'll assume it's at least 3.
{(0,1), (7,3), (2,1), (7,2)}
That's not a function because no two different ordered pairs in
a function can have the same first coordinate, and (7,3) and (7,2)
have the same first coordinate 7.
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[Note: two different ordered pairs in a function CAN have the same SECOND
coordinate, like (0,1) and (2,1) have the same second coordinate. They
are not the reason the above is not a function. (7,3) and (7,2) are the
only reason it's not a function. In a function, the y's can occur twice,
but the x's can't!]
Edwin
