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Answer:
In mathematics, a function can be defined as rule that relates every element in one set, called the domain, to exactly one element in another set, called the range. For example, y = x + 3 and y = x2 – 1 are functions because every x-value produces a different y-value. A relation is any set of ordered-pair numbers.
Step-by-step explanation:
https://www.storyofmathematics.com/relations-and-functions