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

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Senior Manager
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In the xy-plane, the line with equation ax + by + c = 0, [#permalink]  25 Apr 2006, 11:35
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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
Intern
Joined: 25 Apr 2006
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[#permalink]  25 Apr 2006, 11:52
The Answer should be A.
Y = -a/bX -c/b
slope = -a/b.

If 'a' is given then we should be able to find 'b'
VP
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[#permalink]  25 Apr 2006, 11:52

convert the equation to the form y = -a/b*x + c/a

slope is 2/3 = -a/b

Thus, b = -a3/2

Thus Eq A works!
Manager
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[#permalink]  25 Apr 2006, 15:26
Quote:

convert the equation to the form y = -a/b*x + c/a

Agree with your answer, but shouldn't the equation be y = -a/b*x - c/b?
Senior Manager
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[#permalink]  26 Apr 2006, 10:30
Yes guys the OA is A.
What is the formulae of the equation convertion into the form y = -a/b*x + c/a?
Director
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[#permalink]  26 Apr 2006, 10:37
Hallo M8,.
There is no formula, simply transfer ax and c on the right side of the equation and divide by b
Senior Manager
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[#permalink]  26 Apr 2006, 11:06
BG wrote:
Hallo M8,.
There is no formula, simply transfer ax and c on the right side of the equation and divide by b

Sometimes I try to solve easy questions with complicated formulaes.
[#permalink] 26 Apr 2006, 11:06
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# In the xy-plane, the line with equation ax + by + c = 0,

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