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Geometry

by beater » Sun Sep 21, 2008 10:20 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.
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by arvindm07 » Sun Sep 21, 2008 11:15 am
I think its D.

Only a line parallel to the line does not intersect with the line.
(1) : y = -x + 1 slope of a line should be the same as that of this line, in order to be parallel to this line. therefore, slope of L is -1.
(2) same as above, slope = 1.

ps: equation y=mx+c has slope as m.
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by niraj_a » Sun Sep 21, 2008 11:57 am
answer is A for the reason you cited.

statement II is insufficient because this could have any slope. did you mistake intersected to mean perpendicular, like I did the first time?
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by Fab » Sun Sep 21, 2008 3:22 pm
I'll go with E

The fact that the line does not intersect y=-x+1 doesn't mean they have the same slope.
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by Sachindh » Mon Sep 22, 2008 10:11 pm
I think answer is "E"

what is OA?
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by beater » Tue Sep 23, 2008 6:18 am
OA = A. Thanks guys!
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