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Is y x positive? (1) y > 0 (2) x = 1 - y

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Is y x positive? (1) y > 0 (2) x = 1 - y  [#permalink]

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New post 16 May 2011, 12:57
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

55% (01:07) correct 45% (01:17) wrong based on 93 sessions

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Is y – x positive?

(1) y > 0
(2) x = 1 - y

OPEN DISCUSSION OF THIS QUESTION IS HERE: https://gmatclub.com/forum/is-y-x-posit ... 03882.html
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Re: Is y x positive? (1) y > 0 (2) x = 1 - y  [#permalink]

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New post 16 May 2011, 13:02
1
IEsailor wrote:
Is y – x positive?
(1) y > 0
(2) x = 1 - y


Q: Is y-x>0
y>x

Combining both; i.e. y=+ve and y+x=1
x=0.1; y=0.9; y>x
x=0.9; y=0.1; y<x

Not Sufficient.

Ans: "E"
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Re: Is y x positive? (1) y > 0 (2) x = 1 - y  [#permalink]

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New post 16 May 2011, 19:04
essentially its asking y-x>0 means y>x ?

a says nothing about X. Not sufficient.

b x+y = 1, here x= 0.5, y = 0.5 then question stem is neither positive nor negative as its 0.
x =0.6 , y = 0.4 then question stem is negative.
not sufficient.

a+b x+y = 1, y= 0.1, x= 0.9 negative
y=0.9, x= 0.1 positive

hence not sufficient.

E.
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Re: Is y x positive? (1) y > 0 (2) x = 1 - y  [#permalink]

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New post 19 May 2011, 22:23
ans E . plugging some numbers in C makes this clear.
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Re: Is y x positive? (1) y > 0 (2) x = 1 - y  [#permalink]

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New post 28 Nov 2017, 23:56
Is \(x-y>0\)?

Or: is \(x>y\)?

(1) y > 0. Clearly insufficient, as no info about x.

(2) x = 1 – y --> \(x+y=1\) --> the sum of two numbers equals to 1, we can not say from this which one is greater. Not sufficient.

(1)+(2) \(y>0\) and \(x+y=1\) --> also insufficient: if \(x=0.1\) and \(y=0.9\) then the answer is NO but if \(x=0.9\) and \(y=0.1\) then the answer is YES.

Answer: E.

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Re: Is y x positive? (1) y > 0 (2) x = 1 - y &nbs [#permalink] 28 Nov 2017, 23:56
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