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Yes. All functions are relations, but not all relations are functions. Functions have to have only one y-value per x-value.
The same as in any other math class. All functions are relations but all relations are not functions. A function must have only one 'answer' in the range for each value of the domain. Relations are just pairing of numbers with no such restriction on the range.
Functions are special types of relations.
A whole lot of stuff.
I'll attempt to answer this. As worded your question makes no sense. All functions are relations, but not all relations are functions. Like all girls are people but not all people are girls.