In the Rectangular Co-ordinate system shown above : DS Archive
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# In the Rectangular Co-ordinate system shown above

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In the Rectangular Co-ordinate system shown above [#permalink]

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23 Aug 2008, 06:41
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Que:- In the Rectangular Co-ordinate system shown above (it was normal XY plane with 4 Qudrants in it), does the line K intersect quadrant II?

a) The slope of K is -1/6
b) The y-intercept of K is -6

OA - A

Can someone please explain this to me. I think C should be the answer as from A we cannot determine the the value constant (y-intercept) present in the equation of line k (y= -1/6x + c).
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Re: Gmat prep - DS Question - Co-ordinate Geometry [#permalink]

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24 Aug 2008, 14:25
prashi82 wrote:
Que:- In the Rectangular Co-ordinate system shown above (it was normal XY plane with 4 Qudrants in it), does the line K intersect quadrant II?

a) The slope of K is -1/6
b) The y-intercept of K is -6

OA - A

Can someone please explain this to me. I think C should be the answer as from A we cannot determine the the value constant (y-intercept) present in the equation of line k (y= -1/6x + c).

I agree with A.

We don't know the value of C.
C can be +ve or zero or -ve

When +ve

When c is +ve -->Line K intersect quadrants I,II, IV
When c is -ve -->Line K intersect quadrants II,III, IV
When c is zero -->Line K intersect quadrants II,IV

In all these cases.. K intersect quadrants II and IV.

So it should be A.
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Re: Gmat prep - DS Question - Co-ordinate Geometry [#permalink]

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25 Aug 2008, 04:17
A simple observation

any line with -ve slope, will intersect 2nd and 4th quadrant and any line with +ve slope will intersect 1st and 4th quadrant.
Re: Gmat prep - DS Question - Co-ordinate Geometry   [#permalink] 25 Aug 2008, 04:17
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