What's the answer and say it step by step so i understand

You already have what x and y are equal to, so you don't have to solve for anything. It's probably asking you to substitute. Because x=6, in the equation, you put 6 in the place of x so that you have:
6-y+6

You do the same thing with y, and y=1 so substitute and you get:
6-1+6

Now, because there are no parentheses, simply subtract 1 from 6. After, add the difference to 6:
6-1+6
5+6
=11

I hope this is the answer you are looking for and that this example will help you solve any other problems similar to this one.

Ithink if im not mistaking b is -3 but im not a 100% sude