ankitavijay wrote:

Bunuel wrote:

Is xy = x^2 ?

(1) x + y < 0

(2) xy < 0

I think the answer is E.

1) states that x<y- doesn't say if they are equal or not

2)xy<0 - it can be x=-6 and y =1 or vice a versa.

c) not sufficient from 1) and 2)

2)xy<0 - it can be x=-6 and y =1 or vice a versa.

By this sentence we get the information that xy can never be equal to x^2

This is sufficient to answer the question as yes or no.

if x=-6 and y =1 than xy is not equal to x^2.

That's why option B is sufficient to give definite answer for question.