Answer:
x ≠ -2, -1, 0. For example, x = 9.
Step-by-step explanation:
A function in math represents a relationship between two sets of variables, the domain and range. The domain, or independent variable, maps to the range, or the dependent variable. In a function, every value in the domain maps to exactly one value in the range.
In the set of points shown, the domain is {-2, -1, 0, x}. The range is {-4, 1, 3, 5}. In order for this to be a function, x cannot be a repeat of any of the values already seen. If it were, then a value in the domain would map to two different values in the range, making this a non-function. Any other value will make this relation a function.
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