Does this graph show a function? explain how you know.
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a. yes; there are no y-values that have more than one x-value.
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b. no; there are y-values that have more than one x-value.
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c. no; the graph fails the vertical line test.
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d. yes; the graph passes the vertical line test

a function could be identified in 3 ways either on a chart,graph, or ordered pairs. first a function is that each point has its own. the rule is that there can be many x's to one y but there can not be 2 x's at different y's. so on a graph when you put a straight line through the y's there should be one dot only to be a function.

step-by-step explanation: