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

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Senior Manager
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Is x-y+1 greater than x+y-1 1) x>0 2) y<0 [#permalink]  30 Sep 2010, 21:11
1
KUDOS
00:00

Difficulty:

45% (medium)

Question Stats:

51% (01:56) correct 49% (00:54) wrong based on 35 sessions
Is x-y+1 greater than x+y-1

1) x>0
2) y<0
[Reveal] Spoiler: OA

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Re: Inequality Problem [#permalink]  30 Sep 2010, 21:25
Michmax3 wrote:
Is x-y+1 greater than x+y-1

1) x>0
2) y<0

Is x-y+1 > x+y-1

1-y > y-1 => This is possible only if y is negative.

Hence B is sufficient.
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Re: Inequality Problem [#permalink]  30 Sep 2010, 21:32
Michmax3 wrote:
Is x-y+1 greater than x+y-1

1) x>0
2) y<0

x-y+1 > x+y-1
1-y > y-1
2y < 2
y < 1

1) does not talk about x. Insufficient
2) implies y<1.
Sufficient

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Re: Inequality Problem [#permalink]  01 Oct 2010, 07:46
shrouded1 wrote:
Michmax3 wrote:
Is x-y+1 greater than x+y-1

1) x>0
2) y<0

x-y+1 > x+y-1
1-y > y-1
2y < 2
y < 1

1) does not talk about x. Insufficient
2) implies y<1.
Sufficient

Morning!

I'm just beginning to study for the GMAT and have a very weak quant background. I answered this question correctly but it took me 5 minutes to do so. I need to find ways to save time, could you explain to me why you noted that "1) does not talk about x. Insufficient" ? It seems like you removed choice A quickly.

This is probably a terribly novice question but I'm a novice so, I hope you don't mind!

Cheers,
f
Senior Manager
Status: Current Student
Joined: 14 Oct 2009
Posts: 370
Schools: Chicago Booth 2013, Ross, Duke , Kellogg , Stanford, Haas
Followers: 13

Kudos [?]: 101 [1] , given: 53

Re: Inequality Problem [#permalink]  01 Oct 2010, 08:10
1
KUDOS
fronds wrote:
shrouded1 wrote:
Michmax3 wrote:
Is x-y+1 greater than x+y-1

1) x>0
2) y<0

x-y+1 > x+y-1
1-y > y-1
2y < 2
y < 1

1) does not talk about x. Insufficient
2) implies y<1.
Sufficient

Morning!

I'm just beginning to study for the GMAT and have a very weak quant background. I answered this question correctly but it took me 5 minutes to do so. I need to find ways to save time, could you explain to me why you noted that "1) does not talk about x. Insufficient" ? It seems like you removed choice A quickly.

This is probably a terribly novice question but I'm a novice so, I hope you don't mind!

Cheers,
f

After manipulating the question stem (subtracting x on both sides) we are only left with y to determine...since Statement 1 gives x but says nothing about y, which is what we are looking for it is immediately insufficient
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Re: Inequality Problem [#permalink]  01 Oct 2010, 09:06
Michmax3 wrote:

After manipulating the question stem (subtracting x on both sides) we are only left with y to determine...since Statement 1 gives x but says nothing about y, which is what we are looking for it is immediately insufficient

Ah, I see that now. I need to notice the significance of things like this more quickly. Thank you for the answer.
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Re: Inequality Problem [#permalink]  03 Oct 2010, 01:56
Michmax3 wrote:
Is x-y+1 greater than x+y-1

1) x>0
2) y<0

x-y+1>x+y-1 = x-x-y-y+2>0

-2y+2>0

is -y>-1 ie: is y<1

from one obviously insuff

from 2
suff.....b
Re: Inequality Problem   [#permalink] 03 Oct 2010, 01:56
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