Is the OA is C?
This is what I am thinking
1) xy<0 will be true if only one of x or y is -VE. But this didn't answer the ques becuase it can be anything such as x=6 and y=-9, so insufficient
2) x^2 = y^2 will be true for |x|=|y| and for x=y=0. again insufficient
Using both proves one of them is negative and are of same value which is sufficient to answer
x+y=0 as yes
Does x + y = 0?
(2) x^2 = y^2
My answer is different from OA. Can someone explain the logic. Will reveal OA later.