If x is a number that is 7 more than y, how do you express x as a function of y?

A. x = f (y) = 7 + x

B. x = f (y) = 7 + y

C. y = f (x) = 7x

D. y = f (x) = y - 7

E. y = f (x) = 7 + y

I believe the correct answer from the choices listed above is option B. The variable y is the independent variable here and x is the dependent variable so the function can be represented as f (y). The function should be written as:

x = f (y) = 7 + y