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What is the value of m-3n? (1) m^2 = 9n^2 (2) m = -3n

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What is the value of m-3n? (1) m^2 = 9n^2 (2) m = -3n [#permalink] New post 29 Feb 2008, 12:40
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What is the value of m-3n?

(1) m^2 = 9n^2

(2) m = -3n
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Re: DS [#permalink] New post 29 Feb 2008, 12:56
shils01 wrote:
What is the value of m-3n?

(1) m^2 = 9n^2

(2) m = -3n


I get E.

Stmt 1: Square both sides and you get m= 3n,-3n
If m=3n then 3n-3n=0
If m=-3n then -3n-3n=-6n

Stmt 2: m=-3n, so:
-3n-3n=-6n

Since we dont know what n is, it's insuff.
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Re: DS [#permalink] New post 01 Mar 2008, 15:49
E ?

from stat 1, we get (m-3n)(m+3n)=0, cant get any info about n. insuff.

from stat 2, we still cant get a value for n. insuff.

together, we still cant get a value for n. not that i can see, anyways.
Re: DS   [#permalink] 01 Mar 2008, 15:49
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What is the value of m-3n? (1) m^2 = 9n^2 (2) m = -3n

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