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cordinate geometry ds paper test

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blover
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cordinate geometry ds paper test [#permalink] New post   17 Sep 2008, 01:31
00:00
A
B
C
D
E

Difficulty:

(N/A)

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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
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answer is E . please explain how ?



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Re: cordinate geometry ds paper test [#permalink] New post   17 Sep 2008, 02:08
E

stat 1) has no bearing by itself

stat 2 ) same

together ... insuff.
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domleon
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Re: cordinate geometry ds paper test [#permalink] New post   17 Sep 2008, 04:51
blover - thank you for the questions, they are really challenging!

can you please camouflage the answer, because it´s much more motivating if you don´t know the answer from the very beginning :-)

thanks
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Re: cordinate geometry ds paper test [#permalink] New post   17 Sep 2008, 05:47
need more explainations.
can somebody elaborate it more clearly ? this solution does not make sense to me.
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Re: cordinate geometry ds paper test [#permalink] New post   17 Sep 2008, 12:45
I think we need to calculate slope and to get slope we need to points.

however A gives only 1 point and we cannot get slope.

had A given us 2 points we could have calculated the slope and use the point in Question with one of the points in A and see if we get the same slope.

If same slope then on line.

B- doesnt give much info of points on L.

E.

-Jack
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Re: cordinate geometry ds paper test [#permalink] New post   17 Sep 2008, 22:46
blover wrote:
need more explainations.
can somebody elaborate it more clearly ? this solution does not make sense to me.


Trying to simplify......see if this helps.

stmt 1 gives one point and there is a possibility of infinite lines passing through this one point. Hence, it is not sufficient to say that line that passes through this point will also pass through (2,-3).

stmt2 simply eliminates one of the infinite possible lines. This simply says that line l is not vertical. Hence, insufficient.

Combining stmt1 and stmt2 also gives infinite possibilities of line l as it says that the line is passing through point (-2,3) but is not vertical.

Hence, E.



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Re: cordinate geometry ds paper test [#permalink]
17 Sep 2008, 22:46
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