Exercise 1 Page P5

For a relation to be a function, each $x\text{-}$value can only be paired with one $y\text{-}$value, but one $y\text{-}$value can be paired with multiple $x\text{-}$values. Examining the ordered pairs, we can see that there is no $x\text{-}$value with multiple $y\text{-}$values. Therefore, the relation is a function. Now let's look for the domain and range of the given coordinate pairs. The domain of a function is found by listing the relation's $x\text{-}$values. The range is found by listing the relation's $y\text{-}$values.