A relation is a function if every input has a distinct output.
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relation and function are number that combine with number and neqative number to .
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.
Because a function has additional restrictions, which the relation may, or may not, satisfy.
Function is a special case of relation. It means function is a relation but all relations are not functions. Therefore all functions are relations.