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Q: A relation is a function if?

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Not every relation is a function. But every function is a relation. Function is just a part of relation.

No, a function must be a relation although a relation need not be a functions.

Does the graph above show a relation, a function, both a relation and a function, or neither a relation nor a function?

yes.

A function is a relation whose mapping is a bijection.

Not every relation is a function. A function is type of relation in which every element of its domain maps to only one element in the range. However, every function is a relation.

No. A relation is not a special type of function.

A relation is a function if every input has a distinct output.

Good question. A relation is simply that; any x-value to create any y-value. A function, however, cannot be defined for multiple values of x. In other words, for a relation to be a function, it must have singular values for all x within its domain.

No. A relation is not a special type of function.

relation and function are number that combine with number and neqative number to .

No, not every relation is a function. In order for a relation to be a function, each input value must map to exactly one output value. If any input value maps to multiple output values, the relation is not a function.