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Identify the domain and range of each relationship. Represent the relation with a mapping diagram. Is the relation a function?

Identify the domain and range of each relationship. Represent the relation with a-example-1

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Remember, to be a function, all elements in the domain should correspond to one element in the range.
The domain is the x coordinate, range is the y coordinate.
The domain we can solve for as the set {4.2, 5, 7}. The range is the set {0, 1.5, 2.2, 4.8}.
But we see that an element in the domain corresponds to more than one element in the range, thus making it not a function.
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