Question

How do you find the domain and the range of the relation, and state whether or not the relation is a function [(-1,-2),(0,0),(1,2),(2,4)]?

Answer 1

Domain: `{-1, 0, 1, 2}`

Range: `{-2, 0, 2, 4}`

The relation is a function.

Explanation:

The domain is also known as the `x`-values and the range is the `y`-values.

Since we know that a coordinate is written in the form `(x, y)`, the domain is:
`{-1, 0, 1, 2}`

The range is:
`{-2, 0, 2, 4}`

In a function, each `x`-value can only pair with one `y`-value (each input has a single output). Since all the `x`-values are different, the relation is a function.

Hope this helps!