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help!

by likewhoa » Sun Nov 25, 2007 6:39 am
In the XY-plane, what is the slope of line L?

(1) line L does not intersect the line with equation y=1-x

(2) line L intersects the line with equation y=x-1

answer: A
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by sujaysolanki » Sun Nov 25, 2007 7:59 pm
Stumped :? ..anyone ?
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Re: help!

by gabriel » Sun Nov 25, 2007 10:48 pm
likewhoa wrote:In the XY-plane, what is the slope of line L?

(1) line L does not intersect the line with equation y=1-x

(2) line L intersects the line with equation y=x-1

answer: A
Good question .. it tests the most forgotten concept of lines .. the concept says that if 2 lines do not intersect then they have to be parallel .. and parallel lines have the same slope.

The first choice says line L does not intersect the line y = 1-x .. that means line L is parallel to that line, so they both should have the same slope, slope of the second line is -1, hence slope of line L is -1 .. hence the answer A ..
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