how to solve?

[ratindasgupta]

if xy not equal to 0, is x/y < 0?

1. x = - y
2. -x = - (-y)

OA is D and I was thinking E.

1. x = -y, which means x/y = -1. SUFF

2. -x = -(-y), which again means x/y = -1. SUFF
Hence answer is Choice D.