Answer
$y \text{ is a function of }x
\\\text{Domain: }
\left( -\infty,\infty \right)$
Work Step by Step
$\bf{\text{Solution Outline:}}$
To determine if the given equation, $
y=\dfrac{x-3}{2}
,$ is a function, check if $x$ is unique for every value of $y.$
To find the domain, find the set of all possible values of $x.$
$\bf{\text{Solution Details:}}$
For each value of $x,$ dividing the difference of $x$ and $3$ by $2$ will produce a single value of $y.$ Hence, $y$ is a function of $x.$
The variable $x$ can be replaced with any number. Hence, the domain is the set of all real numbers.
The given equation has the following characteristics:
\begin{array}{l}\require{cancel}
y \text{ is a function of }x
\\\text{Domain: }
\left( -\infty,\infty \right)
.\end{array}