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Question

Select the graph(s) which is/are not a function.


A
Can't be determined
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B
Graph A
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C
Graph C
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D
Graph B
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Solution

The correct option is B Graph A
Consider Graph A:


If we pass a vertical line over it, more than one point of the graph intersects vertical line at lot of instance. This means that is not a function.

Consider the Graph B:


If we pass a vertical line over it, there is no instance at which more than one point of the graph intersects the vertical line. This means that it is a function.

Consider the Graph C:


If we pass a vertical line over it, there is no instance at which more than one point of the graph intersects the vertical line. This means that it is also a function.

∴ Graph A is not a function.

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