Question 885618: for the relation:
x y
1 4
2 5
3 4
4 1
Find the domain: A) (1,4) B) [1,4] C) {1,4,5} D) {1,2,3,4}
Is it a function? A) yes B) no C) not enough information to tell D) sometimes
Answer by KMST(5328)   (Show Source):
You can put this solution on YOUR website! A relation is a set of (x,y) ordered pairs.
They can be listed, shown in a table, or graphed.
The domain is the set of all possible x values, so your domain is the set {1,2,3,4}.
For the relation to be a function each x must be paired with only one y.
Since each of the x values in the domain appears only once in the x-column of the table,
each of the x values got paired only once with just one y, and this is a function.
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