I read the above comments regarding needing three steps, having to solve for both x and y, or this being a traditional SAT problem. I understand what everyone is saying … except that I happen to think that this problem can be solved in one step as it requires a negative value for [(y+1)/x] and 11 is not an appealing solution.
Maybe I missing a key mathematical concept here, but if the above does not work, it can still be solved in two steps by first subtracting the two equations and then solving for … (y+1)/x through a simple manipulation from x + 2y = -2.
I must be missing something here.