Which statement about this mapping is true?
see chart below.
x y
0 1
2 2
4
The mapping does not represent y as a function of x, because 1 x-value is related to 2 y-values.
The mapping does not represent y as a function of x, because there are more x-values than related y-values.
The mapping represents y as a function of x, because each x-value is related to exactly one y-value.
The mapping represents y as a function of x, because each y-value is related to exactly one x-value.
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