## Precalculus (6th Edition) Blitzer

The given relation is a function. Domain: $\left\{4, 6, 8\right\}$ Range: $\left\{5, 7, 8\right\}$
RECALL: (i) A function is a relation where every first coordinate is paired with exactly one second coordinate. (ii) The domain of a relation is a set that contains all the first coordinates. (iii) The range of a relation is a set that contains all the second coordinates. Note that each first coordinate of the relation is paired with only one second coordinate. Thus, the given relation is a function. The domain of the relation is $\left\{4, 6, 8\right\}$. The range of the relation is $\left\{5, 7, 8\right\}$.