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If x and y are different integers and x^2 = xy, which of the

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If x and y are different integers and x^2 = xy, which of the [#permalink]

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If x and y are different integers and x^2 = xy, which of the following much be true?

I. x= 0
II. y = 0
III. x = -y

A. I only
B. II only
C. III only
D. I and III only
E. I, II, and III
[Reveal] Spoiler: OA
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Re: If x and y are different integers and x^2 = xy, which of the [#permalink]

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New post 10 Mar 2012, 07:27
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Shko1 wrote:
If x and y are different integers and (x^2)=xy, which of the following much be true?

I. X = 0
II. Y = 0
III. X = -Y

A. I only
B. II only
C. III only
D. I and III only
E. I, II, and III


\(x^2=xy\) --> \(x(x-y)=0\) --> either \(x=0\) or \(x=y\) but since given that \(x\) and \(y\) are different numbers than the second option is out and we have: \(x=0\). So, only I is always true (in fact because of the same reason that \(x\) and \(y\) are different numbers II and III are never true).

Answer: A.
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Re: If x and y are different integers and x^2 = xy, which of the [#permalink]

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New post 20 Nov 2013, 07:11
Bunuel wrote:

\(x^2=xy\) --> \(x(x-y)=0\) --> either \(x=0\) or \(x=y\) but since given that \(x\) and \(y\) are different numbers than the second option is out and we have: \(x=0\). So, only I is always true (in fact because of the same reason that \(x\) and \(y\) are different numbers II and III are never true).

Answer: A.


Thanks for such a nice explanation....
I was confused about option III but your solutions clarifies it perfectly....
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Re: If x and y are different integers and x^2 = xy, which of the [#permalink]

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Re: If x and y are different integers and x^2 = xy, which of the [#permalink]

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New post 29 Nov 2015, 10:39
Shko1 wrote:
If x and y are different integers and x^2 = xy, which of the following much be true?

I. x = 0
II. x = 0
III. x = -y

A. I only
B. II only
C. III only
D. I and III only
E. I, II, and III

Looks like nobody edited original question. According to Bunuel's solution point II should read "Y=0". Please correct
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Re: If x and y are different integers and x^2 = xy, which of the [#permalink]

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New post 08 Aug 2016, 10:06
I did the following which led me to confusion:

x^2 = (x^1)(y^1)
x^2/x^1 = y^1
So, x = y

What am I doing incorrectly here?

Thanks
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Re: If x and y are different integers and x^2 = xy, which of the [#permalink]

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New post 08 Aug 2016, 10:13
In x^2, x may be positive and may be negative , you have to consider both case
But here you have taken x positive only


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Re: If x and y are different integers and x^2 = xy, which of the [#permalink]

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New post 10 Aug 2016, 08:19
Here as X^2=XY => X=0 or X=y but from question stem as x≠y => x=0
So only A is correct as y cannot be zero (else it will equal to x which is not allowed)
Smash that A
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Re: If x and y are different integers and x^2 = xy, which of the   [#permalink] 10 Aug 2016, 08:19
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