Question

-x - y = -9
x - y = 3

Answer 1

Use elimination
-x - y = -9
x - y = 3
Add both equations
-2y = -6, y = 3
-x -(3) = -9
-x = -6, x = 6
Final answer: x = 6, y = 3

Answer 2

Your answer would be: 6,3

If your wanting it in this form.
Hope this helps! And happy holidays!!