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Re: GMATprep - perpedicular [#permalink]
30 Jan 2008, 07:36

Sketch out a little diagram.

We have line K passing through point (1,1) We have line M passing through point (1,-1) which is just 2 spots down in a straight line

1. Line K amd M intersect at point (1,-1) which means line K is a vertical line where X = 1. For M to be perpendicular we need it to be a horizontal line, but this tells us nothing about M. INSUFFICIENT 2. Line K intersects the X-axis at the point (1,0). This is telling us that line K is a vertical line where X = 1, which is something we already figured out from statement 1. Again, line M could be a horizontal line or any other line that passes through (1,-1). INSUFFICIENT

Re: GMATprep - perpedicular [#permalink]
30 Jan 2008, 20:07

you'll see from the info in stem and stat 1 that k is a vertical line. thats fine, but we need to know whether m is a horizontal line.

Neither stat1 or 2 tell us anything about line m, except one point on it. a line passing through that point COULD be horizontal, but it doesnt HAVE to be.

Re: GMATprep - perpedicular [#permalink]
01 Feb 2008, 08:12

As discussed above both statements insufficient and both taken together also tell us about three points for k making it vertical but nothing about m. So answer is E

gmatclubot

Re: GMATprep - perpedicular
[#permalink]
01 Feb 2008, 08:12