Multiply the first eqn by 3 and add the two eqns together:
3x+6y=33
-3x+y=-5 +
7y=28, so y=4. Go back to the original first eqn and substitute y=4:
x+8=11, so, subtracting 8 from each side, x=3.
Check these values in the second eqn: -9+4=-5. True!
So x=3, y=4 is the right answer.