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➷ 12 : 40
==> 3 : 10
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I think a and y is 2 and 3 because in order to get 5 you have to add
        
                    
             
        
        
        
Actually I don't know the answer but what I thing is none of the above.
        
             
        
        
        
First thing you should do is reduce coefficients.
1st equation has all multiples of '2'. Divide by 2
---> x +3y = -6
2nd equation has multiples of 5. Divide by 5.
---> x - y = 2
Now elimination part is easier. 
Eliminate 'x' variable by subtracting 2nd equation from 1st.
   x + 3y = -6
-(x  - y = 2)
----------------------
       4y  = -8
Solve for 'y'
4y = -8
y = (-8)/4 = -2
Substitute value for 'y' back into 2nd equation:
x - (-2) = 2
x + 2 = 2
x = 0
Solution to system is:
x=0, y =-2