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In the xy-plane, line k passes through the point (1,1) and [#permalink]
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)

Re: PREP 8 OF 37 COORD [#permalink]
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

Re: PREP 8 OF 37 COORD [#permalink]
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

gmatclubot

Re: PREP 8 OF 37 COORD
[#permalink]
13 Nov 2008, 10:12

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