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# In the xy-plane, the line with equation ax + by + c = 0,

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Manager
Joined: 17 Dec 2008
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In the xy-plane, the line with equation ax + by + c = 0, [#permalink]  23 Jan 2009, 18:57
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In the xy-plane, the line with equation ax + by + c = 0, where abc ≠ 0, has slope 3/2. What is the value of b?
(1) a = 4
(2) c = −6
SVP
Joined: 07 Nov 2007
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Location: New York
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Re: DS question [#permalink]  23 Jan 2009, 21:25
ConkergMat wrote:
In the xy-plane, the line with equation ax + by + c = 0, where abc ≠ 0, has slope 3/2. What is the value of b?
(1) a = 4
(2) c = −6

y=(-a/b) x+(-c/b)

slope=-a/b = 3/2

(1) a=4
b= -2a/3 = -8/3

sufficient

(2) c = −6

-a/b = 3/2

no relation betwen these two equations.

not sufficient.. we can't find b value

A
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Re: DS question [#permalink]  25 Jan 2009, 13:48
I agree with x2suresh and would have solved it the same way.

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Re: DS question   [#permalink] 25 Jan 2009, 13:48
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