slope

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ketkoag: Legendary Member; Posts: 876; Joined: Thu Apr 10, 2008 8:14 am; Thanked: 13 times

by ketkoag » Wed Apr 08, 2009 4:49 am

In the xy-plane, what is the slope of line l?
(1) Line l dose not intersect the line with equation y = 1 - x.
(2) Line l intersects the line with equation y = x – 1.

My answer is E , but OA: A
I feel my answer to be 99% correct. please explain if i am wrong.

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Source: Beat The GMAT — Data Sufficiency | Wed Apr 08, 2009 4:49 am

bluementor: Master | Next Rank: 500 Posts; Posts: 418; Joined: Wed Jun 11, 2008 5:29 am; Thanked: 65 times

by bluementor » Wed Apr 08, 2009 4:55 am

if 2 lines have the same slope, then they will never intersect. So this means, line l is parallel to y= 1-x. This statement is sufficient on its own.

Choose A.

-BM-

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ketkoag: Legendary Member; Posts: 876; Joined: Thu Apr 10, 2008 8:14 am; Thanked: 13 times

by ketkoag » Wed Apr 08, 2009 3:01 pm

oh yes!! i overlooked xy plane..
got it, thanks.....

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vittalgmat: Legendary Member; Posts: 621; Joined: Wed Apr 09, 2008 7:13 pmFollowed by: 4 members; Thanked: 33 times

Re: slope

by vittalgmat » Wed Apr 08, 2009 3:23 pm

ketkoag wrote:In the xy-plane, what is the slope of line l?
(1) Line l dose not intersect the line with equation y = 1 - x.
(2) Line l intersects the line with equation y = x – 1.

My answer is E , but OA: A
I feel my answer to be 99% correct. please explain if i am wrong.

Indeed the answer should be E.

stmt 1 & 2 dont say anything specific about line L. ie. are they parallel or perpendicular. We cannot determine the slope even by combining 1 and 2.
So E it is.

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cubicle_bound_misfit: Master | Next Rank: 500 Posts; Posts: 246; Joined: Mon May 19, 2008 7:34 am; Location: Texaco Gas Station; Thanked: 7 times

by cubicle_bound_misfit » Wed Apr 08, 2009 8:44 pm

This one is a rather sitter.

in x-y plane two lines will never intersect if and only if they are paralle i.e. their slopes are equal.
hence A is sufficient.

Cubicle Bound Misfit

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vittalgmat: Legendary Member; Posts: 621; Joined: Wed Apr 09, 2008 7:13 pmFollowed by: 4 members; Thanked: 33 times

by vittalgmat » Wed Apr 08, 2009 9:46 pm

cubicle_bound_misfit wrote:This one is a rather sitter.

in x-y plane two lines will never intersect if and only if they are paralle i.e. their slopes are equal.
hence A is sufficient.

Super!!! u r right!!!..
missed this.
If two lines are not parallel, they WILL intersect, atleast asymtotically.
But that begs a question.

If the q stem says as above, should I assume that lines are of infinite length??
Only if we assume that, we can conclude that lines are parallel.

Ian/Stuart/Brent/... Pls help.

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