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# ds: cordinate geometry

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ds: cordinate geometry [#permalink]

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16 Apr 2005, 15:02
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pls explain
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Director
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Re: ds: cordinate geometry [#permalink]

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16 Apr 2005, 16:00
mirhaque wrote:
pls explain

A is the answer

The slope of any line ax+by+c = 0 is -b/a .

From A we know that a*b <0 ie., either a is <0 or b<0.

Since slope is -b/a the slope is +ve......
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16 Apr 2005, 17:11
(B)

Background Calculation: Line intersect X axis in -ve.
=> y = 0 => x= (-C/A)
=> for x to be negetive, (C/A) should be +ve.

So Modified Qus: whether C/A is +ve. (note question is: Are you able to answer this question.)
Now,
i) A*B -ve => either A -ve and B +ve or A +ve or B -ve
A can be +ve or ve and no information about C. So Insufficient.

ii) A*C > 0 => either A and C +ve or A and C -ve. In both cases C/A is +ve. => x -ve. => Sufficient
16 Apr 2005, 17:11
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# ds: cordinate geometry

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