(9, 4), (5, 0), (5, 3), (-2, -6)
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If a set of ordered pairs is not a relation, the set can still be a function.
In general you cannot. Any set of ordered pairs can be a graph, a table, a diagram or relation. Any set of ordered pairs that is one-to-one or many-to-one can be an equation, function.
B.
A set of ordered pairs that assign to each x-value exactly one y-value is called a function.
A set of ordered pairs, can also be tables, graphs, or a mapping diagram