Answer:

Explanation:
We have been given a description. We are supposed to represent our given description in an equation.
We know that input of a function is x values and it is independent variable. The output is y values and it is dependent on x.
The output is three less than the input. We can represent this information in an equation as:
![\text{Output}=\text{Input}-3]()

Therefore, our required equation would be
.