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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