# Is (3,4),(5,4),(1,3),(4,1),(9,4) a function?

Yes it is.

A collection of ordered pairs is a function is no two pairs have the same first and different second elements.

If we arrange these pairs in order of the first element, we can see that there are no two pairs with equal first and different second elements.

(3,4),(5,4),(1,3),(4,1),(9,4)

(1,3), (3,4), (4,1), (5,4), (9,4)

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Yes, the set of ordered pairs {(3,4),(5,4),(1,3),(4,1),(9,4)} represents a function because each input (x-value) is associated with exactly one output (y-value).

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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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