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# What is the difference between a function and a relation?

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A relation is a set of numbers that have a relationship through the use of a domain and a range, while a function is a relation that has a specific set of numbers that causes there to be only be one range of numbers for each domain of numbers. All functions are relations, but all relations are not functions.

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There are numbers that are related to each other in every relation. There could be a large variety of numbers in the domain for a given range. For example, if x is equal to 23, then y could be equal to 46 or 11.5, depending on the factors that are being played into the domain.

In a function, the numbers will always be able to relate back to a single number out of the range of numbers. It can be concluded that if x equals 13, then y will always equal 26. There may be many numbers in a domain that lead to the same range in a function, but there will never be more numbers in a range than a domain. If the number of x changes to 14, then y will change to 28. Many mathematicians use the term "well behaved" for numbers that are part of a function.

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## Related Questions

• A:

A rational expression is a fraction. As with all fractions, the denominator of the expression cannot be equal to zero. The domain of an expression is all of the possible values for x. Finding all the values for x that equal zero shows which x values are restricted and cannot be part of the domain.

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In mathematics, a function's domain is all the possible inputs that the function can accept without breaking and the range is all the possible outputs. A real life example of this is using a simple calculator to add two numbers together. The function is the sum of "n" plus "m," the domain is all real numbers and the output is also all real numbers.

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The associative property means that no matter how a set of numbers is grouped, the answer is the same. This property typically refers to addition and multiplication as these operations can be carried out on a set of numbers in any order to get the same answer.