It assigns exactly one output value for each input value.
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This will be a math function. Each choice is only going to have one answer in this kind of function.
It is a injective relationship. However, it need not be surjective and so will not be bijective. It will, therefore, not define an invertible function.
false
A function assigns a unique value to each input of specified type. It expresses the intuited idea that one quantity completely determines the another quantity.
one value for "Y" for every "X" is related by a function... it cannot be a function if it has more than one Y value for an X value