Question 1198106: State the domain and range for each. Is the relation a function? Why or why not?
(1) {(-1,-4), (3,4), (-3,-9), (2,-4), (-5,8), (0,-4)}
(2) {(18,-142), (87,-142), (-43,-92), (125,111), (87,101), (18,111)}
Answer by MathLover1(20849)   (Show Source):
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State the domain and range for each. Is the relation a function? Why or why not?
(1) {(-1,-4), (3,4), (-3,-9), (2,-4), (-5,8), (0,-4)}
domain: {-5,-3,-1,0,2,3}
range: {-9,-4,4,8}
recall: An ordered pair is represented as (INPUT, OUTPUT):
The relation shows the relationship between INPUT and OUTPUT. Whereas, a function is a relation which derives  OUTPUT for each given INPUT.
in your case every  has one value of  , so the relation  a function
(2) {(18,-142), (87,-142), (-43,-92), (125,111), (87,101), (18,111)}
domain: {-43,18,87,125}
range: {-142,-92,101,111}
Since  produces  and  , the relation is  a function
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