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 (−∞,∞). However, there is a least x-value of 3, the domain includes all numbers greater than
or equal to 3, written as [3,∞)
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