Question 1010110: State the domain and range and tell if it is a function or not. {(-2,5),(-1,1),(3,1),(-1,-2)}
Answer by Miniml1(17)   (Show Source):
You can put this solution on YOUR website! Domains are all of the x values
-2,-1,3,-1
Ranges are all of the y values
5,1,1,2
It is only a function if any x value(domain) pairs with only one y value(range). Sets 2 and 4 have two numbers that go with their domain(-1). This means its not a function because only one number can pair with the domain(-1). This goes the same for any value. If we have more pairs that had -1,-2,3 as the domain and the ranges that they paired up with were all different, they would not be functions. If we cut out either set 2 or 4, then all of our domains would match with only one range.
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