Determine the domain and range of the given graph below.
According to the vertical line test, if every vertical line intersects the graph of a
relation in no more than one point, then the relation is a function. So, the given graph fails
the vertical line test, since the same $x$-value corresponds to two different $y$-values, and is not the graph of a function.
Moreover, the arrow heads indicate that the line extends indefinitely to the right, as well as up and down.
So the range is $(-\infty, \infty)$. However, there is a least $x$-value of $3$, the domain includes all numbers greater than
or equal to $3$, written as $[3,\infty)$
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