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If -2x>3y , is x negative ? 1. y> 0 2. 2x+ 5y -20 =0

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If -2x>3y , is x negative ? 1. y> 0 2. 2x+ 5y -20 =0 [#permalink]

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New post 23 Aug 2009, 00:09
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A
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C
D
E

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If -2x>3y , is x negative ?

1. y> 0
2. 2x+ 5y -20 =0

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Senior Manager
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Re: GMAT prep [#permalink]

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New post 23 Aug 2009, 00:32
If -2x>3y , is x negative ?

1. y> 0
2. 2x+ 5y -20 =0


IMO A:

For -2x>3y if Y is positive the for LHS to be greater it should be positive whihc can only be possible when X would be negative...SUFF


2nd stmt: 2x < - 3y --> in eqn 2x+ 5y =20..... here what could be 2x = -4y, -5y, -6y,-7y and so on.... as 2x < - 3y, so we see that y can be + as well as -ve....NOT SUFF


Let me know if iam correct

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Re: GMAT prep [#permalink]

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New post 23 Aug 2009, 02:12
tkarthi4u wrote:
If -2x>3y , is x negative ?

1. y> 0
2. 2x+ 5y -20 =0


for 1). -2x>3y, y>0, so -2x>0, x<0, suf
for 2). -2x>3y, 2x+5y-20=0
so 5y-20=-2x, then 5y-20>3y, we can get 2y>20, y>10
put y>10 back into 2x+ 5y -20 =0, x must be <0
suf

answer is D.
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Re: GMAT prep [#permalink]

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New post 23 Aug 2009, 03:25
flyingbunny wrote:
tkarthi4u wrote:
If -2x>3y , is x negative ?

1. y> 0
2. 2x+ 5y -20 =0


for 1). -2x>3y, y>0, so -2x>0, x<0, suf
for 2). -2x>3y, 2x+5y-20=0
so 5y-20=-2x, then 5y-20>3y, we can get 2y>20, y>10
put y>10 back into 2x+ 5y -20 =0, x must be <0
suf

answer is D.



Can you cite any reason in my reasoning ...

2nd stmt: 2x < - 3y --> in eqn 2x+ 5y =20..... here what could be 2x = -4y, -5y, -6y,-7y and so on.... as 2x < - 3y, so we see that y can be + as well as -ve....NOT SUFF...


If -4y we take , then y +ve , else y -ve....so X cant be determined... pLs explain

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Re: GMAT prep [#permalink]

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New post 23 Aug 2009, 05:46
rohansherry wrote:
flyingbunny wrote:
tkarthi4u wrote:
If -2x>3y , is x negative ?

1. y> 0
2. 2x+ 5y -20 =0


for 1). -2x>3y, y>0, so -2x>0, x<0, suf
for 2). -2x>3y, 2x+5y-20=0
so 5y-20=-2x, then 5y-20>3y, we can get 2y>20, y>10
put y>10 back into 2x+ 5y -20 =0, x must be <0
suf

answer is D.



Can you cite any reason in my reasoning ...

2nd stmt: 2x < - 3y --> in eqn 2x+ 5y =20..... here what could be 2x = -4y, -5y, -6y,-7y and so on.... as 2x < - 3y, so we see that y can be + as well as -ve....NOT SUFF...


If -4y we take , then y +ve , else y -ve....so X cant be determined... pLs explain


don't understand what you wrote.
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Re: GMAT prep [#permalink]

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New post 23 Aug 2009, 07:29
Thanks flyingbunny. i get it.

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Re: GMAT prep [#permalink]

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New post 27 Aug 2009, 04:39
I may have done something wrong but I answered C..

1. -2x>3y
x<3/2y

If y=1, then x<3/2 not suff

2. 2x+5y-20 = 0 insuff

Combined :
if Y=1
2x-15=0
suff

Can someone telle me where I am wrong?
Thx

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Re: GMAT prep [#permalink]

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New post 27 Aug 2009, 06:01
defoue wrote:
I may have done something wrong but I answered C..

1. -2x>3y
x<3/2y
If y=1, then x<3/2 not suff

2. 2x+5y-20 = 0 insuff

Combined :
if Y=1
2x-15=0
suff

Can someone telle me where I am wrong?
Thx



See the red part it should be negative

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Re: GMAT prep [#permalink]

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New post 27 Aug 2009, 07:55
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Given -2x > 3y

STMT 1:
y> 0 or y is +ve or 3y is +ve

for -2x to be greater than a +ve number 3y, x has to be -ve.

Suff.


STMT 2:
2x+5y - 20 = 0
or -2x = 5y - 20

replacing the value of -2x in the given inequality

5y - 20 > 3y

or 5y - 3y > 20 or y > 10

So for -2x to be greater than 3*10

-2x > 30 or -x > 15 or x < -15

Suff.

Both Individually are Suff. - D

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Re: GMAT prep [#permalink]

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New post 28 Aug 2009, 02:58
rohansherry wrote:
flyingbunny wrote:
tkarthi4u wrote:
If -2x>3y , is x negative ?

1. y> 0
2. 2x+ 5y -20 =0


for 1). -2x>3y, y>0, so -2x>0, x<0, suf
for 2). -2x>3y, 2x+5y-20=0
so 5y-20=-2x, then 5y-20>3y, we can get 2y>20, y>10
put y>10 back into 2x+ 5y -20 =0, x must be <0
suf

answer is D.



Can you cite any reason in my reasoning ...

2nd stmt: 2x < - 3y --> in eqn 2x+ 5y =20..... here what could be 2x = -4y, -5y, -6y,-7y and so on.... as 2x < - 3y, so we see that y can be + as well as -ve....NOT SUFF...


If -4y we take , then y +ve , else y -ve....so X cant be determined... pLs explain


2nd stmt: 2x < - 3y --> in eqn 2x+ 5y =20..... here what could be 2x = -4y, -5y, -6y,-7y

This part is not correct. 2x cannot be -4y,-5y, -6y ....

2x = 20 - 5y that's all we know

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Re: GMAT prep [#permalink]

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New post 28 Aug 2009, 03:15
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flyingbunny wrote:
tkarthi4u wrote:
If -2x>3y , is x negative ?

1. y> 0
2. 2x+ 5y -20 =0


for 1). -2x>3y, y>0, so -2x>0, x<0, suf
for 2). -2x>3y, 2x+5y-20=0
so 5y-20=-2x, then 5y-20>3y, we can get 2y>20, y>10
put y>10 back into 2x+ 5y -20 =0, x must be <0
suf

answer is D.


Love your explaination. I almost solved it except that I could not think of this at all(the one in red). You really need to pay close attention to every detail , eh!
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Re: GMAT prep [#permalink]

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New post 28 Aug 2009, 06:55
bhanushalinikhil wrote:
flyingbunny wrote:
tkarthi4u wrote:
If -2x>3y , is x negative ?

1. y> 0
2. 2x+ 5y -20 =0


for 1). -2x>3y, y>0, so -2x>0, x<0, suf
for 2). -2x>3y, 2x+5y-20=0
so 5y-20=-2x, then 5y-20>3y, we can get 2y>20, y>10
put y>10 back into 2x+ 5y -20 =0, x must be <0
suf

answer is D.


Love your explaination. I almost solved it except that I could not think of this at all(the one in red). You really need to pay close attention to every detail , eh!


glad it helps. :-D
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Re: If -2x>3y , is x negative ? 1. y> 0 2. 2x+ 5y -20 =0 [#permalink]

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Re: If -2x>3y , is x negative ? 1. y> 0 2. 2x+ 5y -20 =0   [#permalink] 26 Dec 2017, 05:13
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