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In which quadrant of the coordinate plane does the point

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In which quadrant of the coordinate plane does the point [#permalink] New post 12 Nov 2009, 11:11
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Last edited by Bunuel on 27 Jun 2013, 21:17, edited 1 time in total.
Added the OA
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Re: Quadrant for the point [#permalink] New post 12 Nov 2009, 13:40
D for me as well

(x,y) lies in first quadrant since both are positive!!
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Re: Quadrant for the point [#permalink] New post 12 Nov 2009, 15:28
Bunuel wrote:
In which quadrant of the coordinate plane does the point (x,y) lie?

(1) |xy| + x|y| + |x|y + xy > 0
(2) -x < -y < |y|


i'll take d as well

bunuel..post some good inquality ds questions
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Re: Quadrant for the point [#permalink] New post 12 Nov 2009, 17:58
Bunuel wrote:
In which quadrant of the coordinate plane does the point (x,y) lie?

(1) |xy| + x|y| + |x|y + xy > 0
(2) -x < -y < |y|



1. Given condition is true only if both X and Y are positive, so (X,Y) is in I quadrant. SUFFICIENT
2. Given condition is true only if both X and Y are positive, so (X,Y) is in I quadrant. SUFFICIENT

Ans 'D'
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Re: Quadrant for the point [#permalink] New post 13 Nov 2009, 21:19
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Re: Quadrant for the point [#permalink] New post 13 Nov 2009, 22:18
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Statement 1:

To determine what quadrant (x,y) is in, we need to see if either value is positive or negative. To test this, it best to just plug in:

|xy| + x|y| + |x|y + xy > 0
(2,3): 6+6+6+6>0 CHECK!
(-2,-3): 6-6-6+6>0 No good
(2,-3): 6+6-6-6>0 No good
(-2,3): 6-6+6-6>0 No good

SUFFICIENT

Statement 2:
-x < -y < |y|
For -y < |y| to remain true, y must be positive.
If y is positive, then x must also be positive for -x < -y to be true.

SUFFICIENT

Answer: D.
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Re: Quadrant for the point [#permalink] New post 13 Nov 2009, 22:40
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Bunuel wrote:
In which quadrant of the coordinate plane does the point (x,y) lie?

(1) |xy| + x|y| + |x|y + xy > 0
(2) -x < -y < |y|



@bunuel,

Can we simplify the stmt 2 as follows

x>y>-|y| (mutiply by -1)

x > y + |y|.
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Re: Quadrant for the point [#permalink] New post 13 Nov 2009, 22:57
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FedX wrote:
Bunuel wrote:
In which quadrant of the coordinate plane does the point (x,y) lie?

(1) |xy| + x|y| + |x|y + xy > 0
(2) -x < -y < |y|



@bunuel,

Can we simplify the stmt 2 as follows

x>y>-|y| (mutiply by -1)

x > y + |y|.


We can multiply by -1 and write: x>y>-|y|

y>-|y| says that y is positive,
And if x is more than y, which is positive, means x is positive.

We cannot write x > y + |y| from x>y>-|y|. If you add |y| to one part of x>y>-|y|, you should add to all: x+|y| > y+|y| >0.
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Re: Quadrant for the point [#permalink] New post 15 Nov 2009, 02:20
If this is 600-700 level question, i cant imagine 700-800level qs.
Bunuel, We want more problems on co-ordinate DS and inEquality DS.
Is it possible to post it in sets and then you set the time for each set...say 10qs 15mins...something like that?
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Re: Quadrant for the point [#permalink] New post 16 Nov 2009, 03:33
Bunuel, I am definitely with ctrlaltdel on his request for more problem sets in groups. Thanks!!! :-D
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Re: Quadrant for the point [#permalink] New post 15 Mar 2011, 20:09
From (1), it must be Q1, The only value +ve is |xy| and any other quadrant can make the value < 0 depending on size of x or y.



From (2), -y < |y| so -y is -ve and |y| is +ve, hence y is +ve, so it can be II or 1st Quadrant.

And -x < -y => say -3 < -2 but x > y ( 3 > 2) , as y is +ve so x is +ve, hence it's Q1.

So answer is D.
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Re: In which quadrant of the coordinate plane does the point [#permalink] New post 18 Jun 2012, 04:58
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Bunuel wrote:
In which quadrant of the coordinate plane does the point (x,y) lie?

(1) |xy| + x|y| + |x|y + xy > 0
(2) -x < -y < |y|


A remark regarding statement (1):

Since |xy|=|x||y|, the given expression can be written as (|x|+x)(|y|+y)>0. If either x or y is non-positive, the given expression equals 0.
Otherwise, it is positive. So, necessarily, both x and y must be positive, and Statement (1) is sufficient.
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Re: In which quadrant of the coordinate plane does the point [#permalink] New post 18 Jun 2012, 05:40
D - But i took 2 mins! :(
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Re: In which quadrant of the coordinate plane does the point [#permalink] New post 27 Mar 2013, 01:37
In which quadrant of the coordinate plane does the point (x, y) lie?

(1) |xy| + x|y| + |x|y + xy > 0
Case quadrant I (x,y)=(+,+)
|xy| + x|y| + |x|y + xy
xy +xy + xy + xy >0
The first term is positive, the second the third and the fourt also. The sum of 4 positive integers is >0. so quadrant I is possible
Case quadrant II (x,y)=(-,+)
The first term is positive(as always will be), the second is negative, the third is positive, the fourth is negative
|(-x)y| + (-x)|y| + |(-x)|y + (-x)y
xy -xy + xy - xy =0 and not >0 so quadrant II is not possible
Case quadrant III (x,y)=(+,-)
The first term is positive(as always will be), the second is positive, the third is negative, the fourth is negative
|x(-y)| + x|(-y)| + |x|(-y) + x(-y)
xy + xy - xy - xy =0 not >0 so quadrant III is not possible
Case quadrant IV (x,y)=(-,-)
The first term is positive(as always will be), the second is negative, the third is negative, the fourth is positive
|(-x)(-y)| + (-x)|(-y)| + |(-x)|(-y) + (-x)(-y)
xy -xy - xy + xy =0 and not >0 so quadrant IV is not possible

SUFFICIENT

(2) -x < -y < |y|

|y|>-y
case y>0
y>-y
y>0
case y<0
-y>-y
So y>0 must be the case here
We know that -y >-x and that y>0, we can sum these elements
-y+y>-x+0
0>-x
x>0
and given that x>0 and that y>0 the point is in the first quadrant

SUFFICIENT
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Re: In which quadrant of the coordinate plane does the point [#permalink] New post 27 Mar 2013, 03:47
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mun23 wrote:
In which quadrant of the coordinate plane does the point (x, y) lie?

(1) |xy| + x|y| + |x|y + xy > 0
(2) -x < -y < |y|

Need help............


From F.S 1, for x,y>0, we can see that the sum will always be positive. For cases where x and y have opposite signs, the term |x|y and |y|x will cancel out each other and similarly, the terms |xy| and xy. Thus it will always be 0 hence not greater than 0. For the case where both x,y<0; the terms |x|y and |y|x will add upto give -2xy and the other two will give 2xy , thus again a 0. Thus Only in the first quadrant, is the given condition possible. Sufficient.

From F.S 2, we know that -y<|y|. Thus we can conclude that y>0. This leads to only the first or the second quadrant. Also, we have -x<-y or x>y. As, in the second quadrant, x<0, thus this is possible only in the first quadrant.Sufficient.

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Re: In which quadrant of the coordinate plane does the point [#permalink] New post 29 Jul 2014, 16:17
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Re: In which quadrant of the coordinate plane does the point [#permalink] New post 31 Jul 2014, 04:12
Bunuel wrote:
In which quadrant of the coordinate plane does the point (x,y) lie?

(1) |xy| + x|y| + |x|y + xy > 0
(2) -x < -y < |y|



Hello Bunuel

Please Help. I dont know what i am missing in 2nd statement.

------ -x ------ -y ------|y|
From 2: for sure y will always be positive.

now by number plunging
let y= 5

then trying for x = 2 , -2 ,10 , -10

when x =2
then -2 > -5
i.e. -x > -y

it does not satisfy the Equation above -x < -y < |y|

whereas when x=10
then -10 < -5
i.e. -x < -y
which satisfies the equation.

so how can x be +ve Always.

What am i missing here. :roll: :cry:
Please help

Thankyou
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Re: In which quadrant of the coordinate plane does the point [#permalink] New post 31 Jul 2014, 06:25
Expert's post
niyantg wrote:
Bunuel wrote:
In which quadrant of the coordinate plane does the point (x,y) lie?

(1) |xy| + x|y| + |x|y + xy > 0
(2) -x < -y < |y|



Hello Bunuel

Please Help. I dont know what i am missing in 2nd statement.

------ -x ------ -y ------|y|
From 2: for sure y will always be positive.

now by number plunging
let y= 5

then trying for x = 2 , -2 ,10 , -10

when x =2
then -2 > -5
i.e. -x > -y

it does not satisfy the Equation above -x < -y < |y|

whereas when x=10
then -10 < -5
i.e. -x < -y
which satisfies the equation.

so how can x be +ve Always.

What am i missing here. :roll: :cry:
Please help

Thankyou


From (2) we get that y must be positive.

So, we have that -x < -y --> y < x --> x is greater than y, which we know is positive so x also must be positive.
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Re: In which quadrant of the coordinate plane does the point [#permalink] New post 01 Aug 2014, 04:05
Thankyou Bunuel

Got my mistake !! :)

Bunuel wrote:
niyantg wrote:
Bunuel wrote:
In which quadrant of the coordinate plane does the point (x,y) lie?

(1) |xy| + x|y| + |x|y + xy > 0
(2) -x < -y < |y|



Hello Bunuel

Please Help. I dont know what i am missing in 2nd statement.

------ -x ------ -y ------|y|
From 2: for sure y will always be positive.

now by number plunging
let y= 5

then trying for x = 2 , -2 ,10 , -10

when x =2
then -2 > -5
i.e. -x > -y

it does not satisfy the Equation above -x < -y < |y|

whereas when x=10
then -10 < -5
i.e. -x < -y
which satisfies the equation.

so how can x be +ve Always.

What am i missing here. :roll: :cry:
Please help

Thankyou


From (2) we get that y must be positive.

So, we have that -x < -y --> y < x --> x is greater than y, which we know is positive so x also must be positive.
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Re: In which quadrant of the coordinate plane does the point [#permalink] New post 17 Aug 2014, 23:27
Bunuel , can u pls give one complete solution for this question. It is simplest to learn from your solutions which are short and apt.
Re: In which quadrant of the coordinate plane does the point   [#permalink] 17 Aug 2014, 23:27
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