Question

How to solve y + x = 2

Answer 1

y + x = 2
y + x - x = 2 - x
y = 2 - x
y = -x + 2

Answer 2

Not enough information to "solve for X and Y". it can be a number of things; 1 and 1. 0 and 2. -1 and 3. There is no solving unless there is more information