A very long method. The same method only but in a precise way. As the problem is of a little advanced level, every minute detail is not necessary. Add 2xy on both sides of equation one. From equation two Put xy = 3-(x+y) in equation one. Then bring everything left and you would get a quadratic equation in (x+y). Solve it. You would get (x+y) = -6 or 3. The rest is same to get the answers