When is a relation a function?

Answer 1
Given two sets #A# and #B# (they could be sets of numbers, but also what you want...), a relation is a certain number of arrows that joints some elements of #A# with some elements of #B#.
A function is a particular relation that joints every element of #A# with one and only one element of #B#.
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Answer 2

A relation is a function if each input value (domain element) is associated with exactly one output value (range element). In other words, for every input, there is only one corresponding output.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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