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

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Is x-y+1 greater than x+y-1 1) x>0 2) y<0 [#permalink] New post 30 Sep 2010, 21:11
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A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

54% (01:56) correct 46% (01:15) wrong based on 13 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] New post 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] New post 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

Answer : b
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Re: Inequality Problem [#permalink] New post 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

Answer : b


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
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Re: Inequality Problem [#permalink] New post 01 Oct 2010, 08:10
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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

Answer : b


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] New post 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] New post 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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