OptionD is the answer
3x + y =4
-2x-y=-7 (Changing to minus)
-----------------
1x=-3
=>x=-3
Now to find y ,just substitute the value of x in any one of the equations,
Thus, we get ,
3x+y=4
=>3*-3+y=4
=>-9+y=4
=>y=4+9
=>y=13
=>(-3,13) is the answer
Hope this helps you.!!