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

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Senior Manager
Joined: 11 Sep 2005
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In the xy-plane, the line with equation ax + by + c = 0, [#permalink]  06 Oct 2007, 22:02
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In the xy-plane, the line with equation ax + by + c = 0, where abc ≠ 0, has slope 2/3 . What is the value of b?

1. a = 4
2. c = -6
Senior Manager
Joined: 11 Sep 2005
Posts: 329
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Kudos [?]: 45 [0], given: 0

[#permalink]  06 Oct 2007, 22:07
I suppose either of the informations are sufficient to answer the question on their own!

we know slope - so if we get to know either a OR c, we can calculate b! Unless, we have parallel lines.............so we will have multiple a/b/c values!
Senior Manager
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[#permalink]  06 Oct 2007, 22:15
It is A,

by=-ax-c

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

-(a/b)=2/3 this is the slope

1. Sufficient plug in a b will come up
2. Insuff c nothing to do with equation

Ans: A
[#permalink] 06 Oct 2007, 22:15
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# In the xy-plane, the line with equation ax + by + c = 0,

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