Question 210074: state the domain and range of {(-5,2), (4,3), (-2,0), (-5,1)}. then state whether the relation is a function.
Answer by jim_thompson5910(35256)   (Show Source):
You can put this solution on YOUR website! The domain is simply the set of all allowable inputs or x values. Since all points are of the form (x,y), the domain is just the set of all of the first coordinates.
The range is the set of outputs which are y values. Using the point (x,y), the range is just the set of all of the second coordinates.
Now ask yourself: is there an x value that produces two different outputs? If so, then the relation is NOT a function.
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