Question 426713
At any given x, y = f(x) + d is d units higher (or lower) than y = f(x). For example, consider the functions {{{y = x*sin(x)}}} and {{{y = x*sin(x) + 5}}}, outlined in red and green, respectively:

{{{graph(300,300,-20,20,-20,20,x*sin(x), x*sin(x) + 5)}}}