What is the domain?
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[tex]\{ -2, 4, 5, 9 \}[/tex]
The Domain of a Relation is just the set of the [tex]x[/tex] values of the ordered pairs in the relation (Recall that if you have an ordered pair, [tex](a,b)[/tex], [tex]a[/tex] is the [tex]x[/tex] value).
We are given the relation: [tex]\{(9,-2),(-2,-10),(5,-9),(4,5) \}[/tex]. The Domain of this relation is [tex]\{ 9, -2, 5, 4 \}[/tex].