Question

write two integer whose sum is six and difference is also six

Answer 1

The equations can  be made as,
x+y=6....(1)
and 
x-y=6.....(2)
 
Adding (1) and (2)
2x=12
x=6 
putting in (1) 
we get,
y=0
Thus the two integers are 6 and 0.
Hope this helps.