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Is |x| + |y| = 0 (1) x + 2|y| = 0 (2) y + 2|x| = 0

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Joined: 02 Sep 2009
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Is |x| + |y| = 0 (1) x + 2|y| = 0 (2) y + 2|x| = 0 [#permalink]

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New post 05 Mar 2018, 09:45
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A
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C
D
E

Difficulty:

  75% (hard)

Question Stats:

51% (01:05) correct 49% (01:21) wrong based on 94 sessions

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Expert Post
Math Expert
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Joined: 02 Aug 2009
Posts: 5899
Re: Is |x| + |y| = 0 (1) x + 2|y| = 0 (2) y + 2|x| = 0 [#permalink]

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New post 05 Mar 2018, 09:59
Bunuel wrote:
Is |x| + |y| = 0

(1) x + 2|y| = 0

(2) y + 2|x| = 0



|x| + |y| = 0 is possible only when x =y =0

(1) x + 2|y| = 0
both x and y could be 0
or x= -2|y|, so say y =1 , x = -1
insuff

(2) y + 2|x| = 0
SAME as statement I above
insuff

combined..
x+y+2|x|+2|y|=0
x=-2|y| not possible as then y cannot equal -2|x|
so x=y=0..
ans is YES for "is |x|+|y|=0?"
suff
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Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html


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Re: Is |x| + |y| = 0 (1) x + 2|y| = 0 (2) y + 2|x| = 0 [#permalink]

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New post 05 Mar 2018, 10:46
Is |x| + |y| = 0
only possible when x=0 and y =0
statement 1
x + 2|y| = 0
possible values :
x=-2, y= 1 (No |x| + |y| is not equal to zero )
x=0 y =0 (yes |x| + |y| is equal to zero )
Not sufficient
statement 2
same as in statement 1
not sufficient
combining
x=0, y=0 (sufficient )
hence answer should be C
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Re: Is |x| + |y| = 0 (1) x + 2|y| = 0 (2) y + 2|x| = 0 [#permalink]

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New post 12 Mar 2018, 04:13
Bunuel wrote:
Is |x| + |y| = 0

(1) x + 2|y| = 0

(2) y + 2|x| = 0


Is |x| + |y| = 0 ?
First, think of possible scenarios where this is true. Due to Modulus, the only possibility is if x=0 and y=0. Remember this when approaching Statement 1 and 2.

(1) x + 2|y| = 0
If x=0 and y=0, then our answer is Yes.
If we make x=-2 and y=1, then this statement will satisfy the equation, however our answer to the question will now be No.
Yes+No=NF

(2) y + 2|x| = 0
If x=0 and y=0, then our answer is Yes.
If we make y=-2 and x=1, this this statement satisfies the equation, however our answer to the question will now be No.
Yes+No=NF

(1)+(2) x+y+2|x|+2|y|=0
If x=0 and y=0, then our answer is Yes.
There is not a possible scenario where you can use negative numbers for x or y and satisfy the equation.
Therefore, the only possible answer here is x=0 y=0. Yes. Sufficient

Answer: C
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Re: Is |x| + |y| = 0 (1) x + 2|y| = 0 (2) y + 2|x| = 0 [#permalink]

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New post 12 Mar 2018, 05:18
Chetan could you please explain the logic used here ?

Im a bit confused
Re: Is |x| + |y| = 0 (1) x + 2|y| = 0 (2) y + 2|x| = 0   [#permalink] 12 Mar 2018, 05:18
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