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# If x^2 = y^2, what is the value of x-y?

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Re: If x^2 = y^2, what is the value of x-y? [#permalink]
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If x^2 = y^2, what is the value of x-y?

1) x+y = 8
2) x/y = -1

Dear Moderator,

This is a perfectly valid question. The fact that the two statements contradict each other implies that the combination of both should not be done. Therefore, we can advance that answers C and E are not possible.

What cannot happen in GMAT is that each statement is not sufficient and that when we combine both statements, they contradict each other. However, this is not the case in this question, so I do not understand why you have locked the previous topic with this question.

I would appreciate that you would let me share and discuss this question with all of you.

Thank you.
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Re: If x^2 = y^2, what is the value of x-y? [#permalink]
EBITDA wrote:
If x^2 = y^2, what is the value of x-y?

1) x+y = 8
2) x/y = -1

Dear Moderator,

This is a perfectly valid question. The fact that the two statements contradict each other implies that the combination of both should not be done. Therefore, we can advance that answers C and E are not possible.

What cannot happen in GMAT is that each statement is not sufficient and that when we combine both statements, they contradict each other. However, this is not the case in this question, so I do not understand why you have locked the previous topic with this question.

I would appreciate that you would let me share and discuss this question with all of you.

Thank you.

This is TOTALLY wrong. A book or a prep course which says otherwise is not of a high quality.

We have a discussion on this issue here: do-both-sufficient-statements-provide-the-same-answer-in-a-ds-question-135812.html

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Re: If x^2 = y^2, what is the value of x-y? [#permalink]
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