No, it is not a function.
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(2,-3),(-4,2),(6,2),(-5,-3),(-3,0)
It is both.
No it is not. The number 3, in the domain, gets mapped to more than one number in the range.
The domain consists of the set {3, 4, 5, 8}
The domain of the inverse of a relation is the range of the relation. Similarly, the range of the inverse of a relation is the domain of the relation.