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Visual comparison of a function and a non-function using domain and range diagrams.

Two diagrams comparing relations, showing Relation #1 as a function with unique x-values mapping to y-values, and Relation #2 as not a function because the x-value 5 maps to two different y-values (a and c).

Two diagrams comparing relations, showing Relation #1 as a function with unique x-values mapping to y-values, and Relation #2 as not a function because the x-value 5 maps to two different y-values (a and c).

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