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In the xy-plane, line k passes through the point (1,1) and

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In the xy-plane, line k passes through the point (1,1) and [#permalink] New post 13 Nov 2008, 04:27
In the xy-plane, line k passes through the point (1,1) and the line m passes through the point (1,-1). Are the lines k and m perpendicular to each other?

1) Lines k and m intersect at the point (1,-1)

2) Line k intersects the x-axis at the point (1,0)
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Re: PREP 8 OF 37 COORD [#permalink] New post 13 Nov 2008, 04:37
According to 1) Slope of K is 1--1/1-1 = 2/0 infinity but says nothing about slope of M....not suff
2) Again can talk about only line K slop and nothing about m....not suff
Both together also do not talk about the slope of m

Ans E
OA?
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Re: PREP 8 OF 37 COORD [#permalink] New post 13 Nov 2008, 09:40
E

From both the stmt's we can only figure out the slope of line K, but not line m
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Re: PREP 8 OF 37 COORD [#permalink] New post 13 Nov 2008, 10:12
Stmt 1 insuff as the two lines can have any slope only point of intersection is given
stmt 2 insuff again as we can only conclude that line k is perpendicular to X axis
together 1 and 2 insuff we get tht line k intersects x axis at perpendicularly and m at (1,-1) nothing about slope of m can be concluded hence insuff

E is the answer
Re: PREP 8 OF 37 COORD   [#permalink] 13 Nov 2008, 10:12
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In the xy-plane, line k passes through the point (1,1) and

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