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Is x greater than y? (1) x - y^2 >0 (2) xy < 0

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Joined: 21 Sep 2011
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GMAT 1: 650 Q50 V29
Is x greater than y? (1) x - y^2 >0 (2) xy < 0  [#permalink]

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New post Updated on: 15 Jul 2018, 21:39
1
2
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

61% (01:09) correct 39% (01:26) wrong based on 112 sessions

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Is x greater than y?

(1) x - y^2 >0
(2) xy < 0

Originally posted by shirley916 on 29 Oct 2011, 10:00.
Last edited by Bunuel on 15 Jul 2018, 21:39, edited 2 times in total.
Renamed the topic and edited the question.
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Re: Is x greater than y? (1) x - y^2 >0 (2) xy < 0  [#permalink]

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New post 29 Oct 2011, 10:20
3
1
shirley916 wrote:
Is x greater than y?

1) x- y^2 >0
2) xy<0


1)
x>y^2
x=0.4; y=0.5; y^2=0.25; x>y^2, but x<y
x=2; y=1; y^2=1; x>y^2, and x>y
Not Sufficient.

2)
xy<0
Either x or y is -ve, but we don't know which one.
Not Sufficient.

Using both;
x>y^2; means, x can't be -ve because square is always greater than equal to 0.
y=-ve;
x=+ve.
Sufficient.

Ans: "C"
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Re: Is x greater than y? (1) x - y^2 >0 (2) xy < 0  [#permalink]

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New post 29 Oct 2011, 13:49
even i thought its C but was confused about statemnt 1.....Nice explanation Fluke thanks
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Re: Is x greater than y? (1) x - y^2 >0 (2) xy < 0  [#permalink]

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New post 29 Oct 2011, 16:07
I picked E but I see why C is correct...Nice explanation fluke.
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Re: Is x greater than y? (1) x - y^2 >0 (2) xy < 0  [#permalink]

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New post 30 Oct 2011, 15:13
1
shirley916 wrote:
Is x greater than y?

1) x- y^2 >0
2) xy<0

i think the answer is A but not sure...

the official answer from the study guide is C


from 1, we know that x>y^2, but we don't know whether y<y^2, because if 0<y<1, then the reverse is true.

But combined with 2, we know that x, y must be a positive and a negative, and if x>y^2, then x must be positive, and a positive is greater than a negative.

So, it's C
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Re: Is x greater than y? (1) x - y^2 >0 (2) xy < 0  [#permalink]

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New post 29 Aug 2018, 04:19
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Is x greater than y? (1) x - y^2 >0 (2) xy < 0 &nbs [#permalink] 29 Aug 2018, 04:19
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