Question 6266
see this ones easy !!
3x+y=1
5x-y=1

Now by simulteneous eqns y gets cut !!
Now we know tat 8x=2
therefore x=1/4 (u got till here correct)
now if we substitute the value of x in eqn-1
we get-
1/4 + y =1
y = 1 - 1/4
  = 4-1
  -------
     4
therefore y = 3/4 (not -3/4)