First rearrange the second equation and isolate for Y so x-y=6 would become -y=6-x but you can’t hav a negative Y so divide everything by -1 so you end up with y=x-6
Now plug it in the first equation so
X+(x-6)=4 and solve it
Your gonna get x=5
You don’t need to solve For y because in all the options you listed only One has 5 as the x value so u can assume the answer is (5,-1)