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# Is x-y+1 greater than x+y-1 ? (1) x > 0 (2) y < 0

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Manager
Joined: 30 May 2010
Posts: 186
Is x-y+1 greater than x+y-1 ? (1) x > 0 (2) y < 0 [#permalink]

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18 Aug 2010, 00:30
00:00

Difficulty:

35% (medium)

Question Stats:

74% (00:38) correct 26% (00:57) wrong based on 31 sessions

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Is $$x-y+1$$ greater than $$x+y-1$$?

(1) $$x > 0$$

(2) $$y < 0$$

OPEN DISCUSSION OF THIS QUESTION IS HERE: is-x-y-1-greater-than-x-y-131613.html

--== Message from GMAT Club Team ==--

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[Reveal] Spoiler: OA
Manager
Joined: 30 May 2010
Posts: 186
Re: Is x-y+1 greater than x+y-1 ? (1) x > 0 (2) y < 0 [#permalink]

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18 Aug 2010, 00:34
First simplify:

$$x+1>x+2y-1$$ ?

$$x>x+2y-2$$ ?

$$0>2y-2$$ ?

$$0>2(y-1)$$ ?

$$0>y-1$$ ?

Finally, is $$y < 1$$ ?

(1) Insufficient, nothing given about y.
(2) Sufficient, $$y<0$$ so it must be less than 1.
Manager
Joined: 24 Dec 2009
Posts: 206
Re: Is x-y+1 greater than x+y-1 ? (1) x > 0 (2) y < 0 [#permalink]

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18 Aug 2010, 14:10
x - y + 1 > x + y - 1

simplified version - y < 1 ?

A - not sufficient
B - y < 0 hence it has to be less than 1.
B sufficient.

Thanks,
Akhil M.Parekh
Manager
Joined: 23 Jan 2011
Posts: 125
Re: Is x-y+1 greater than x+y-1 ? (1) x > 0 (2) y < 0 [#permalink]

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01 Jun 2011, 14:15
Is x-y+1 greater than x+y-1?
1) x>0
2) y<0
Manager
Status: Preparing myself to break the sound( 700 )-barrier!
Joined: 15 Feb 2011
Posts: 204
Re: Is x-y+1 greater than x+y-1 ? (1) x > 0 (2) y < 0 [#permalink]

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01 Jun 2011, 16:58

Because, X and Y can take as many numbers as possible. And there is no specific solution for the two options (x>0 and y<0).

Thanks!
Manager
Joined: 16 Mar 2011
Posts: 179
Re: Is x-y+1 greater than x+y-1 ? (1) x > 0 (2) y < 0 [#permalink]

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01 Jun 2011, 18:00
i think that 2 is sufficient only. if y<0 the first expression will be bigger, since x-(-#)+1 will be bigger than x+(-#)-1
Manager
Joined: 23 Jan 2011
Posts: 125
Re: Is x-y+1 greater than x+y-1 ? (1) x > 0 (2) y < 0 [#permalink]

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01 Jun 2011, 23:58
Agree with ashkanator. OA is B.

If x= -3, y= -2, then -3-(-2)+1>-3-2-1, this equals 0>-6, Sufficient
If x= 3, y= -2, then 3-(-2)+1>3-2+1, this equals 6>2, sufficient.

B is sufficient.
TOEFL Forum Moderator
Joined: 16 Nov 2010
Posts: 1508
Location: United States (IN)
Concentration: Strategy, Technology
Re: Is x-y+1 greater than x+y-1 ? (1) x > 0 (2) y < 0 [#permalink]

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03 Jun 2011, 07:24
Is x - y + 1 > x + y - 1

or, 0 > y - 2

or y < 2

So x is immaterial.

(1) Insufficient

(2)

Sufficient

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Current Student
Joined: 26 May 2005
Posts: 541
Re: Is x-y+1 greater than x+y-1 ? (1) x > 0 (2) y < 0 [#permalink]

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03 Jun 2011, 07:31
subhashghosh wrote:
Is x - y + 1 > x + y - 1

or, 0 > y - 2

or y < 2

So x is immaterial.

(1) Insufficient

(2)

Sufficient

How did u get y<2
isnt it y<1?
TOEFL Forum Moderator
Joined: 16 Nov 2010
Posts: 1508
Location: United States (IN)
Concentration: Strategy, Technology
Re: Is x-y+1 greater than x+y-1 ? (1) x > 0 (2) y < 0 [#permalink]

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03 Jun 2011, 18:04
Oh yes, you're right, it's a typo, still the answer remains the same, i.e., B.
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Director
Joined: 01 Feb 2011
Posts: 696
Re: Is x-y+1 greater than x+y-1 ? (1) x > 0 (2) y < 0 [#permalink]

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03 Jun 2011, 18:12
x-y+1 > x+y-1 ?

y<1 ?

1. Not sufficient

as we dont know anything about y.

2. Sufficient

y<0 => y<1

Manager
Status: Preparing myself to break the sound( 700 )-barrier!
Joined: 15 Feb 2011
Posts: 204
Re: Is x-y+1 greater than x+y-1 ? (1) x > 0 (2) y < 0 [#permalink]

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04 Jun 2011, 03:55
Schawjibb wrote:

Because, X and Y can take as many numbers as possible. And there is no specific solution for the two options (x>0 and y<0).

Thanks!

Doomed! Miles to go! Now I understand, the answer should be B. Thanks to all!
Manager
Joined: 28 Feb 2011
Posts: 74
Re: Is x-y+1 greater than x+y-1 ? (1) x > 0 (2) y < 0 [#permalink]

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04 Jun 2011, 05:05
IMO B..

initially it looked as a smoother and outrightly thought E..but thought, it shouldn't be that easy so dug in a little..nice one
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Manager
Joined: 05 Jul 2010
Posts: 179
Re: Is x-y+1 greater than x+y-1 ? (1) x > 0 (2) y < 0 [#permalink]

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04 Jun 2011, 19:21
yes B is the right one. Basically the question is asking is 1-y > y-1, and since Y < 0, 1-y will always be positive where as y-1 will be negative.
Math Expert
Joined: 02 Sep 2009
Posts: 44386
Re: Is x-y+1 greater than x+y-1 ? (1) x > 0 (2) y < 0 [#permalink]

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14 Aug 2017, 05:23
[quote="jpr200012"]Is $$x-y+1$$ greater than $$x+y-1$$?

(1) $$x > 0$$

(2) [m]y x+y-1? --> x's cancel out and we get: is 2>2y? --> is y 0. Not sufficient.
(2) y < 0. The answer to the question is YES. Sufficient.

OPEN DISCUSSION OF THIS QUESTION IS HERE: is-x-y-1-greater-than-x-y-131613.html

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

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Re: Is x-y+1 greater than x+y-1 ? (1) x > 0 (2) y < 0   [#permalink] 14 Aug 2017, 05:23
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