If a variable 'y' depends upon a variable 'x' in such a way that each value of 'x' determines exactly one value of 'y', then we say that
Answer: y is a function of x
Explanation
 If each value of 'x' determines exactly one value of 'y', then:
The variable y depends on x
For every input x, there is a unique output y
This is the definition of a function in mathematics.
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