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A relation is a rule that relates values from a set of values (called the domain) to a second values (called the range). a relation is a set of ordered pairs. a = { (1, 3), (2, 4), (1, 5), (4, 6), (5, 7)} a function is a relation where each element in the domain is related to only one element in the range by some rule. a function is a set of ordered pairs such that no two ordered pairs have the same first element. a = { (1, 3), (2, 4), (3, 5), (4, 6), (5, 7)}