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X-Y plane

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X-Y plane

by danjuma » Mon Sep 20, 2010 2:50 pm
1. In the xy plane, line k passes through the point (1, 1) and line m passes through the point (1, -1). Are line m and k perpendicular to each other?


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

b.Line k intersect the x -axis at the point (1,0).

Thank you for your attention.
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Source: — Data Sufficiency |
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by Gurpinder » Mon Sep 20, 2010 4:48 pm
if you draw little figures you should be able to solve it.

imo (e)

the question gives you 2 points of 2 lines. you can solve this question by either knowing the slope of of the lines or any other point in the lines.

both are telling you that the line is vertical.


your right hpengineer
Last edited by Gurpinder on Mon Sep 20, 2010 5:27 pm, edited 2 times in total.
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by HPengineer » Mon Sep 20, 2010 5:21 pm
The way i read this problem is that they only give us one point about M that it passes thru (1,-1)...

For me from the statements all i can deduce is that line K is a vertical line?? Dont we have to know that M is a horizontal line? Not sure we can prove that from the given info

i would put this answer at E... probably im wrong
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