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# GMATPREPDS:Is x negative

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Senior Manager
Joined: 20 Feb 2008
Posts: 295
Location: Bangalore, India
Schools: R1:Cornell, Yale, NYU. R2: Haas, MIT, Ross

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17 May 2008, 21:16
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SVP
Joined: 04 May 2006
Posts: 1895
Schools: CBS, Kellogg

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17 May 2008, 21:58
ventivish wrote:

D

-2x>3y --> x<-[3/2]y

1. y>0 --> -3/2y<0, so x<0 suff
2. 2x+ 3y + 2y = 20

2x+3y <0, so maximum of [2x+3y] is 0, so minimum of y is 10 >0, so and so, another way of 1 statement!
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Director
Joined: 05 Jan 2008
Posts: 687

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18 May 2008, 22:00
I am getting E, I plugged in numbers and checked

-2X>3Y

x=-3,y=1

-2(-3)>3(1) =6>1

using stmt-1 Y>0 take y=2,x=-2
-2(-2)>3(2)=4>6 false
-2(-2)>3(1)= 4>3 true thus insufficient

using stmt-2

2x+5y-20=0

for all the values of -ve values of Y , x would be +ve
for all the values +ve values of Y >4, x would be -ve

thus 2 insufficient

1&2 combined also does not help thus E for me
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SVP
Joined: 04 May 2006
Posts: 1895
Schools: CBS, Kellogg

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18 May 2008, 23:35
You are right, I knew where I am wrong! Thanks!
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Director
Joined: 01 May 2007
Posts: 793

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19 May 2008, 09:02
Is there anyway to solve this by rephrasing? I hate plugging in.
Director
Joined: 01 May 2007
Posts: 793

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19 May 2008, 09:08
Manhattan says OA is D. Does anyone have the official? http://www.manhattangmat.com/forums/is- ... t1451.html
SVP
Joined: 28 Dec 2005
Posts: 1559

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19 May 2008, 09:41
i am also getting D.

from stat 1, since y is positive, the only way for the inequality to hold is if the left side is positive, and that necessitates x being negative

from stat 2, i actually worked out that x=-15 ... because you have the equation in stat2, and you know that -2x-3y=0 ....
SVP
Joined: 04 May 2006
Posts: 1895
Schools: CBS, Kellogg

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21 May 2008, 01:49
prasannar wrote:
I am getting E, I plugged in numbers and checked

-2X>3Y

x=-3,y=1

-2(-3)>3(1) =6>1

using stmt-1 Y>0 take y=2,x=-2
-2(-2)>3(2)=4>6 false
-2(-2)>3(1)= 4>3 true thus insufficient

using stmt-2

2x+5y-20=0

for all the values of -ve values of Y , x would be +ve
for all the values +ve values of Y >4, x would be -ve

thus 2 insufficient

1&2 combined also does not help thus E for me

I am looking for the clue that make your reasoning wrong! The color is wrong! admittedly, there is something confusing in my reasoning, so in condition with headach, I am easily persuaded that you are right!
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Director
Joined: 05 Jan 2008
Posts: 687

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21 May 2008, 02:47
yup D it should be.

I am improving at DS guys with your help
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Persistence+Patience+Persistence+Patience=G...O...A...L

Re: GMATPREPDS:Is x negative   [#permalink] 21 May 2008, 02:47
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