Asked by MW3

{(3,-4),(3,-2),(0,1),(2,-1)}
what is the function?
what is the domain?
what is the range?
Answered by mathhelper
the domain is the set of x values, so {0, 2, 3}
the range is the set of y values, so {-4, -2, 1, -1}

by the way, you don't have a function, since the same x value of 3
yields more than one unique value of y

Review your definition of function.

There is no quick discernible rule for your set of points
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