Examples

$(- 3, - 4)$ , $(- 2, - 9)$

Step 1

Since for each value of $x$ there is one and only one value of $y$ , the given relation $(- 3, - 4), (- 2, - 9)$ is a function.

The relation is a function.

Step 2

Since the relation is a function and for each value of $y$ there is one and only one value of $x$ , the given relation $(- 3, - 4), (- 2, - 9)$ is a one-to-one function.

The relation is a one-to-one function.

Step 3

Every point in the range is the value of $y$ for at least one point $x$ in the domain, so this is a surjective function.

Surjective function

Step 4

Since $(- 3, - 4), (- 2, - 9)$ is injective (one to one) and surjective, then it is bijective function.

Bijective function

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