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24 Nov 2007, 08:19
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Is x·|y| > y2?
(1) x > y
(2) y > 0
Solution :
we know :
x* y > y^2 or x > y ----- I
-xy > y^2 or -x > y or x less than -y ------------ II
Both statement has to be proven
(1). x > y doesn't tell anything about (II) - insufficient
(2). Y > 0 don't have any info on x --- insufficient
Together :
x >y and y > 0
x = 2 y = 1
2 > 1 ---- I proven
2 < - 1 ---- no proven too.
Both are sufficient to answer the question. Please validate my approach and answer. thanks in advance.
(1) x > y
(2) y > 0
Solution :
we know :
x* y > y^2 or x > y ----- I
-xy > y^2 or -x > y or x less than -y ------------ II
Both statement has to be proven
(1). x > y doesn't tell anything about (II) - insufficient
(2). Y > 0 don't have any info on x --- insufficient
Together :
x >y and y > 0
x = 2 y = 1
2 > 1 ---- I proven
2 < - 1 ---- no proven too.
Both are sufficient to answer the question. Please validate my approach and answer. thanks in advance.
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24 Nov 2007, 09:23
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[quote="alimad"]Is x·|y| > y2?
(1) x > y
(2) y > 0
Solution :
we know :
x* y > y^2 or x > y ----- I
-xy > y^2 or -x > y or x less than -y ------------ II
Both statement has to be proven
(1). x > y doesn't tell anything about (II) - insufficient
(2). Y > 0 don't have any info on x --- insufficient
Together :
x >y and y > 0
x = 2 y = 1
2 > 1 ---- I proven
2 <1>0 doesnt help
X>Y and Y +ive does help us.
(1) x > y
(2) y > 0
Solution :
we know :
x* y > y^2 or x > y ----- I
-xy > y^2 or -x > y or x less than -y ------------ II
Both statement has to be proven
(1). x > y doesn't tell anything about (II) - insufficient
(2). Y > 0 don't have any info on x --- insufficient
Together :
x >y and y > 0
x = 2 y = 1
2 > 1 ---- I proven
2 <1>0 doesnt help
X>Y and Y +ive does help us.
17 Dec 2007, 07:59
Kudos
Bookmarks
i think its C as well.
i started with stat 2, with tells us y is positive. this means we can break down stem into xy>2y --> x>y
but we dont know anything about x, so B itself is insufficient
looking at stat 1, it tells us x>y, which by itself isnt enough, but satisfies the condition raised with stat2, so C
i started with stat 2, with tells us y is positive. this means we can break down stem into xy>2y --> x>y
but we dont know anything about x, so B itself is insufficient
looking at stat 1, it tells us x>y, which by itself isnt enough, but satisfies the condition raised with stat2, so C
