What is the domain of the function shown in the mapping?

a.) {x | x = –5, –3, 1, 2, 6}
b.) {y | y = –9, –6, 0, 2, 4}
c.) {x | x = –9, –6, –5, –3, 0, 1, 2, 4, 6}
d.) {y | y = –9, –6, –5, –3, 0, 1, 2, 4, 6}

Choice A
The domain is the set {-5, -3, 1, 2, 6} which can be written as {x| x=-5, -3, 1, 2, 6} if you want to make it clear that x is involved with the domain.



Explanation:

The domain is the set of x values, or the set of inputs, of a function or relation. All you have to do is list off the values in the "input" oval. Those values from top to bottom are: -3, 2, -5, 1, 6. Sort them out from smallest to largest and you get -5, -3, 1, 2, 6 which points us to choice A.

Another route you could go is eliminating choices B, C and D because -9 is not in the "input" oval.