Final answer:
The function that has an output of 7 for every input is a constant function with a slope of 0. None of the given options have the same slope.
Step-by-step explanation:
The function that has an output of 7 for every input is a constant function. A constant function is a function that has the same value for all inputs. In this case, the function can be represented as y = 7. The slope of a constant function is always 0, so none of the options (a), (b), (c), or (d) have the same slope as the given function.