I'm doing some seemingly basic transformations with functions and I need a quick little help.

The universal mapping notation for solving the equations is: (x/k +d, ay +c)

Now, if I'm correct, the d is always opposite right? If you have a minus for the equation, it is + when you input and vice versa. But what about the c? It says +c. Does that mean it is always +? Or is it whatever it is in the equation?

Thank you!