It seems you're presenting a system of equations:

1. $x - y + 1$
2. $x + y = 3$

To clarify, do you mean the first equation to be: $x - y + 1 = 0$ or is it simply $x - y + 1$ by itself?

If it is $x - y + 1 = 0$, the system would be:

1. $x - y + 1 = 0$
2. $x + y = 3$

Let me know so I can solve it for you!