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HELP PLEASE

Which of the following graphs is not a function

HELP PLEASE Which of the following graphs is not a function-example-1
HELP PLEASE Which of the following graphs is not a function-example-1
HELP PLEASE Which of the following graphs is not a function-example-2
HELP PLEASE Which of the following graphs is not a function-example-3
HELP PLEASE Which of the following graphs is not a function-example-4
User Twinlakes
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a simple rule to tell whether a graph is a function is to pretend to cut it vertically, if any cut intercept the graph twice, it is not a function. otherwise, it is.
In this case, the heart is not a function, because if you cut it up-down direction, your imaginary knife will touch the edge of the heart twice.
I hope this explanation helps.
User Roman Kuzmin
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