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In the xy-plane, what is the slope of line l?

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In the xy-plane, what is the slope of line l? [#permalink] New post 22 Sep 2004, 13:52
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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.


Does it mean that from1- line l is parallel to given line, hence same slope?
[Reveal] Spoiler: OA

Last edited by Bunuel on 27 Jun 2013, 20:32, edited 2 times in total.
Added the OA
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Re: DS Slope of a line [#permalink] New post 22 Sep 2004, 14:11
saurya_s wrote:
Q34:
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.




Does it mean that from1- line l is parallel to given line, hence same slope?


A it is
Yes if lines dont intersect they are parallel
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Re: In the xy-plane, what is the slope of line l? [#permalink] New post 29 Jan 2012, 06:44
if two lines do not intersect then they are must parallel and their slopes are equal.
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Re: In the xy-plane, what is the slope of line l? [#permalink] New post 29 Jan 2012, 06:53
Expert's post
saurya_s 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.

Does it mean that from1- line l is parallel to given line, hence same slope?


Yes, if the lines do not intersect in the xy-plane, then they are parallel and have the same slope. So, (1) is sufficient: slope of L=-1 and (2) is not as there are infinite # of lines which intersects the line y=x-1.

Answer: A.

For more on this topic check Coordinate Geometry chapter of math Book: math-coordinate-geometry-87652.html

Hope it helps.
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Re: In the xy-plane, what is the slope of line l? [#permalink] New post 23 Jan 2014, 10:34
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Re: In the xy-plane, what is the slope of line l?   [#permalink] 23 Jan 2014, 10:34
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