If , the value of x, y, a and b are : 1. x = 2, y = 1, a = 5 and b = 10 2. x = -2, y = 1, a = 5 and b = 10 3. x = 2, y = -1, a = 5 and b = 10 4. x = 2, y = 1, a = -5 and b = 10