Math question! please help

By functional theory, we conclude the function described in a table, whose domain is x ∈ [-1, 1] (-1 ≤ x ≤ 1) and whose range is y ∈ [3, 7] (3 ≤ x ≤ 7)
Relations are formed by two sets of values, an input set named domain and an output set named range. Functions are relations such that every element of the domain has only one element of the range.
In this question we show a function describe in a table, whose domain is x ∈ [-1, 1] (-1 ≤ x ≤ 1) and whose range is y ∈ [3, 7] (3 ≤ x ≤ 7).
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