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Co-ordinate Geometry #5

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Co-ordinate Geometry #5

by papgust » Sat Oct 17, 2009 7:10 pm
Which of the following straight lines passes through the origin?

A. x+y=4
B. x^2+y^2=-6
C. x+y=5
D. x=4y

Source: Arun Sharma's Quantitative Aptitude for CAT

Solution and explanation pls? I will give the OA after a few discussions
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by NikolayZ » Sun Oct 18, 2009 11:25 am
Hey!
If line passes through the origin, you have to plug x=0 (or y=0) into the line equation, and get y=0 also
(or x=0). origin is the point with measurements (0;0).
Among all given answer choices only D satisfies the condition of a problem.
Answer D.
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by papgust » Sun Oct 18, 2009 11:00 pm
Thanks again! OA is D.
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