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

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Intern
Joined: 26 Feb 2008
Posts: 37

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

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29 Feb 2008, 12:40
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What is the value of m-3n?

(1) m^2 = 9n^2

(2) m = -3n

Kudos [?]: 7 [0], given: 0

Director
Joined: 26 Jul 2007
Posts: 535

Kudos [?]: 192 [0], given: 0

Schools: Stern, McCombs, Marshall, Wharton
Re: DS [#permalink]

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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.

Kudos [?]: 192 [0], given: 0

SVP
Joined: 28 Dec 2005
Posts: 1543

Kudos [?]: 189 [0], given: 2

Re: DS [#permalink]

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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.

Kudos [?]: 189 [0], given: 2

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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