## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$a.\quad 3$ $b.\quad-3$
The graph of a function is the set containing points $(x,f(x))$, where x is an element of the domain, and f(x) is the corresponding element of the range, meaning that we use the horizontal axis for $x$, the domain, and the vertical axis for $y=f(x)$, the range. $a.\quad$ $(1,3)$ is a point on the graph, so $f( 1)=3$ $b.\quad$ $(-3,2)$ is the only point on the graph with second coordinate $2.$ So, $x=-3$ is the only x for which $f(x)=2.$