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lines n and p lie in the xy-plane. is the slope of line n

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Manager
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lines n and p lie in the xy-plane. is the slope of line n [#permalink] New post 24 Aug 2006, 14:31
00:00
A
B
C
D
E

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lines 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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 [#permalink] New post 24 Aug 2006, 14:55
Answer is E...

1) Fixes quadrant of intersection. However, insufficient alone.
2) Fixes the slopes of the lines once the point of intersection is defined. Insufficient alone.

However, both taken together will give you the answer.
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 [#permalink] New post 24 Aug 2006, 15:07
Getting C

ST1: Insuff
ST2: Insuff

Together: Suff.
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 [#permalink] New post 24 Aug 2006, 18:08
Another C, if Y-Int of n is greater then that of p, then slop of line n is less then p.
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 [#permalink] New post 24 Aug 2006, 22:30
from 1,
for line n,

5 = m1 + c1 = > m1 = 5 - c1

for line p,

5 = m2 + c2 => m2 = 5 - c2

insufficeint.

from 2,
c1 > c2

insufficient.

from 1 and 2

m2> m1 hence C
  [#permalink] 24 Aug 2006, 22:30
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lines n and p lie in the xy-plane. is the slope of line n

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