In a function, each x-value has y-value.

Explanation:

In a function, each x-value has one y-value.

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That is the definition of a relation that is a function.

hello from mrbilldoesmath!

answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

you,

mrb