Using the range concept, the equation among those given that has the smallest range is: y = a.
The range of a function is the set that contains all possible output values for the function.
Considering a function in the format y = f(x), the range is composed by the values of y.
The smallest possible range is when y assumes only one value, and among the options given, the only one in which y is constant is:
y = a.
More can be learned about the range of a function at https://brainly.com/question/10891721
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