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# If x^2+5y=49, is y an integer? 1. 1<x<4 2. x^2 is an

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Intern
Joined: 05 Apr 2008
Posts: 23
If x^2+5y=49, is y an integer? 1. 1<x<4 2. x^2 is an [#permalink]

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06 Sep 2008, 19:14
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If x^2+5y=49, is y an integer?

1. 1<x<4
2. x^2 is an ineger

a) 1 is sufficient
b) 2 is sufficient
c) 1 & 2 together are sufficient
d) Either 1 or 2 is sufficient
e) Neither 1 nor 2 is sufficient
Current Student
Joined: 11 May 2008
Posts: 552
Re: Math Question - Data Sufficiency [#permalink]

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06 Sep 2008, 20:49
E.

5y=49-x^2
y=(49-x^2)/5.. for y to be an integer, the numerator should be a multiple of 5.

stat 1) if x=2, yes if x=2.5 no insuff

stat2) if x^2=3,4,5,6,7,8,9,10.. insuff.

together x=2, yes, x=1.732 no.
insuff.
Manager
Joined: 03 Jun 2008
Posts: 131
Schools: ISB, Tuck, Michigan (Ross), Darden, MBS
Re: Math Question - Data Sufficiency [#permalink]

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07 Sep 2008, 00:56
HVD1975 wrote:
If x^2+5y=49, is y an integer?

1. 1<x<4
2. x^2 is an ineger

a) 1 is sufficient
b) 2 is sufficient
c) 1 & 2 together are sufficient
d) Either 1 or 2 is sufficient
e) Neither 1 nor 2 is sufficient

E
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Re: Math Question - Data Sufficiency   [#permalink] 07 Sep 2008, 00:56
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# If x^2+5y=49, is y an integer? 1. 1<x<4 2. x^2 is an

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