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will the image of this ball, lie?

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will the image of this ball, lie?

by sanju09 » Tue Jan 12, 2010 6:10 am
A very small ball lies at the point (3, 2) in the X - Y plane. The ball is then shifted straight down 5 units. If Y-axis were a mirror, then at what point will the image of this ball, lie?
(A) (3, -2)
(B) (-3, -3)
(C) (-3, -2)
(D)(-2, -2)
(E) (-2, -3)
Last edited by sanju09 on Wed Jan 13, 2010 2:52 am, edited 1 time in total.
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by linkinpark » Tue Jan 12, 2010 6:36 am
is it (-3,-3)? just a guess don't have proper reason, after moving 5 down actual point will be (3,-3) so ideally mirror image will be on other side of quadrant.
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by Stuart@KaplanGMAT » Tue Jan 12, 2010 1:05 pm
sanju09 wrote:A very small ball lies at the point (3, 2) in the X - Y plane. The ball is now shifted by 5 units towards the negative Y-axis. If Y-axis were a mirror, then at what point will the image of this ball, lie?
(A) (3, -2)
(B) (-3, -3)
(C) (-3, -2)
(D)(-2, -2)
(E) (-2, -3)
I have a problem with the phrase "the ball is now shifted by 5 units towards the negative Y-axis". Is this a real GMAT question?

"Towards the negative Y-axis" is too ambiguous to be part of a proper question. At what angle are we approaching the axis? At which point on the y-axis are we aiming.

The question should instead read:

"the ball is now shifted downwards 5 units, parallel to the y-axis"

or, even simpler:

"the ball is now shifted straight down 5 units".

If that's the proper interpretation, then linkinpark has the correct answer.
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by sanju09 » Wed Jan 13, 2010 2:53 am
Thank you Stuart, edited.
The mind is everything. What you think you become. -Lord Buddha



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Quantitative Instructor
The Princeton Review - Manya Abroad
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