Vertical Line Test A graph represents a function if and only if each vertical line intersects the graph at most once. Example 3: Vertical Line Test. Which of the following graphs can be graphs of functions?
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(a) In this graph, each vertical line intersects the graph at most once. Show more…
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Identify each graph as (a) the graph of a function or (b) the graph of a relation that is not a function. Use the vertical-line test.
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