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# Line n and p lie in the xy plane. Is the slope of line n

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Line n and p lie in the xy plane. Is the slope of line n [#permalink]

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09 Dec 2005, 21:15
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Line n and p lie in the xy plane. Is the slope of line n less than the slope of line p?

1. lines n and p intersect at the point (5,1)

2. the y-intercept of line n is greater than the y-intercept of line p.
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09 Dec 2005, 21:48
I'm not quite sure about the definition of a slope...
A slope should be an absolute value, right?
If so, I think it is (E).
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09 Dec 2005, 22:04
laxieqv wrote:
gamjatang wrote:
I'm not quite sure about the definition of a slope...
A slope should be an absolute value, right?
If so, I think it is (E).

a slope can be + or -

Thanks, Laxie.

Candy candy~

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10 Dec 2005, 05:56
if the slopes are -ve only then we can answer the question combining 1 and 2

but we don't know whether the slope is positive or negative.

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10 Dec 2005, 07:50
Jennif102 wrote:
Line n and p lie in the xy plane. Is the slope of line n less than the slope of line p?

1. lines n and p intersect at the point (5,1)

2. the y-intercept of line n is greater than the y-intercept of line p.

1 . This stmt is clearly insuff coz the two lines can rotate freely around the point (5,1) --->insuff

2. see my illustration.

1 and 2
Let ( 0, y1) be the y-intersect of n, (0, y2) be of p
we have:
the slope of n= (y1-1)/ (0-5) = (y1-1)/-5
similarly, the slope of line p= (y2-1)/-5

we have y1> y2 ----> y1 -1> y2 -1 ----> (y1 -1 )/ -5 < (y2 -1 ) / -5
----> answer to the question: yes
---->suff

C it is.
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np.doc [25.5 KiB]

Re: Intrsecting lines   [#permalink] 10 Dec 2005, 07:50
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