GMAT question - If xy is not equal to... - Review

If , what is the value of ?

1. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient
2. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient
3. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient
4. EACH statement ALONE is sufficient
5. Statements (1) and (2) TOGETHER are NOT sufficient

Explanation

Simplify the question

This is another case of being able to express the question in a different way to make it easier to answer.

Is statement (1) sufficient?

Now that we have restated the question it should be clear to you that this statement is sufficient to answer the question, because we can rearrange the eqaution given in statement (1) as follows

And therefore

Is statement (2) sufficient?

Statement (2) tells us the value of but tells us nothing about and therefore is not sufficient to answer the question.

Choose an answer

Statement (1) is sufficient and statement (2) is not which means that the answer is A.