Help pls ty it’s solving systems of linear equations by graphing

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

Just tell me how to set up the equation.

Multiply and simplify. (x - 4) (x^2 – 5x – 6) i will mark brainliest if your answer is right. show how you got the answer. if your answer is correct but does not show how you got the answer you will not be marked brainliest.