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# Is x > y ? (1) x^2 = 4 (2) y^3 = –8

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Math Expert
Joined: 02 Sep 2009
Posts: 52294
Is x > y ? (1) x^2 = 4 (2) y^3 = –8  [#permalink]

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10 Jun 2018, 03:55
00:00

Difficulty:

25% (medium)

Question Stats:

77% (00:33) correct 23% (00:29) wrong based on 37 sessions

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Is x > y ?

(1) x^2 = 4
(2) y^3 = –8

_________________
Manager
Joined: 10 Jun 2018
Posts: 55
Location: Australia
Concentration: Technology, General Management
GPA: 2.88
WE: Science (Pharmaceuticals and Biotech)
Re: Is x > y ? (1) x^2 = 4 (2) y^3 = –8  [#permalink]

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10 Jun 2018, 06:05
Firstly, and clearly, neither statements are alone sufficient. Because You have to figure out two variables (or at least they have to clearly relate somehow), which neither statement offers.

For each statement though, we could at least figure out what x or y is. From statement (1), x = 2 or -2. From statement (2), y = -2. Combined, we have x = y or x > y. Since we can't be sure if x > y or not, combined the two statements are still not sufficient.
_________________

Not a professional entity or a quant/verbal expert or anything. So take my answers with a grain of salt.

Director
Joined: 31 Oct 2013
Posts: 953
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: Is x > y ? (1) x^2 = 4 (2) y^3 = –8  [#permalink]

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10 Jun 2018, 18:28
Bunuel wrote:
Is x > y ?

(1) x^2 = 4
(2) y^3 = –8

we are asked to find out whether x>y or not.

statement 1:

only the value of x can be found out. No information regarding y. Thus , Not sufficient . but the value of x is either +2 or -2.

Statement 2:

The same case as statement 1. The value of y is -2.

Combining both statements:

x= +2 or -2
y = -2

As we have 2 values for x, it is impossible to be specific that which one is greater between x and y .

Thus, The best answer is E.
Intern
Joined: 31 Jan 2017
Posts: 9
Re: Is x > y ? (1) x^2 = 4 (2) y^3 = –8  [#permalink]

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15 Jun 2018, 14:33
1) x^2 = 4 --> x = 2 or x = -2
NOT SUFFICIENT

2) y^3 = -8 --> y = -2
NOT SUFFICIENT

1+2) x = 2 & y = -2 --> 2 > -2 YES
x = -2 & y =-2 --> -2 > -2 NO
NOT SUFFICIENT

Re: Is x > y ? (1) x^2 = 4 (2) y^3 = –8 &nbs [#permalink] 15 Jun 2018, 14:33
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