Question 388244: What are the domain and range of the relations: {(-1,-2),(1,-2),(3,1)}? Is the relation of the function?
A. D={-1,1,3};R={-2,1};yes
B. D={-2,1};R={-1,2,3};no
C. D={-1,-2,3};R={-1,1};no
D. D={-2,1};R={-2,1};yes
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Answer by MathLover1(20850)   (Show Source):
You can put this solution on YOUR website!
{(-1,-2),(1,-2),(3,1)}
The above list of points, being a relationship between certain x's and certain y's, is a relation. The  is all the , and the  is all the  . To give the domain and the range, I just list the values without duplication:
domain: {-1, 1, 3, }
range: { –2, 1}
While the given set does represent a relation (because x's and y's are being related to each other), they gave you one point with the same x-value: (-1, –2) and (-1, 1). Since x = -1 gives you one possible destination, then this relation is a function.
so, your answer is 
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