?Which of the following is not true about functions and relations?
?
A. ?Relations are not always functions.
B. ?Relations are pairings of inputs and outputs.
C. ?For a function to exist, every x value must have one and only one y value.
D. ?For a function to exist, every x value must have one and only one y value and every y value must have one and only one x value.
E. ?A function maps an x value to one and only one y value.
Answer: D
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A. 
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?
?
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