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Is y an integer

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Is y an integer

by uptowngirl92 » Sun Oct 04, 2009 3:24 am
x^2+5y=49 .Is y an integer?
1. 1<x<4
2. X^2 is an integer

Stmt 1 insuff. We dont know whether x is an integer or not.
Stmt 2 insuff.
Combined:
If x^2 is an integer,then x is an integer.Poss values of x=2,3 which makes y an integer.IMO C.
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Re: Is y an integer

by umaa » Sun Oct 04, 2009 7:11 am
uptowngirl92 wrote:x^2+5y=49 .Is y an integer?
1. 1<x<4
2. X^2 is an integer

Stmt 1 insuff. We dont know whether x is an integer or not.
Stmt 2 insuff.
Combined:
If x^2 is an integer,then x is an integer.Poss values of x=2,3 which makes y an integer.IMO C.
IMO C. What is OA?
What we think, we become
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Re: Is y an integer

by Mozartain » Sun Oct 04, 2009 8:09 am
uptowngirl92 wrote: If x^2 is an integer,then x is an integer.Poss values of x=2,3 which makes y an integer.IMO C.
Say x^2 = 10, which is an integer. Is x an integer? No. I believe this is a common and classic illusion.
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by crackgmat007 » Sun Oct 04, 2009 7:18 pm
IMO E

x^2+5y=49 .Is y an integer?
1. 1<x<4
2. X^2 is an integer

1&2

X^2 can be any integer > 1 & less than 16. Pick numbers (say X^2 = 3 or 4 - note that question never says x is an integer) and solve the equation. We get Yes & No answers for Y.

HTH
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