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To find the coordinates of point C

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by gmattesttaker2 » Sun Nov 24, 2013 11:55 am
Hello,

Can you please assist with this:

In a rectangular system, if points (-5, -2) and C are symmetrical to line y = x, what
are the (x, y) coordinates of point C?

OA: [spoiler](-2, -5)[/spoiler]

I am not really clear with how to solve this symmetry works. Can you please assist?


Thanks a lot,
Sri
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by [email protected] » Sun Nov 24, 2013 5:36 pm
Hi Sri,

In these sorts of graphing questions, the word "symmetric" means "mirror image on the other side of the line."

For this question, try drawing the line Y = X and plotting the point (-5, -2); this point is NOT on the line, but you can use it to figure out the symmetric/mirror-image of the other point on the other side of the line.

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by gmattesttaker2 » Sun Nov 24, 2013 8:31 pm
[email protected] wrote:Hi Sri,

In these sorts of graphing questions, the word "symmetric" means "mirror image on the other side of the line."

For this question, try drawing the line Y = X and plotting the point (-5, -2); this point is NOT on the line, but you can use it to figure out the symmetric/mirror-image of the other point on the other side of the line.

GMAT assassins aren't born, they're made,
Rich

Hi Rich,

Thanks for the suggestion. I created a graph and was able to see that (-2,-5) is the mirror image of (-5, -2). In general, is interchanging the x and y co-ordinates the correct approach for these kinds of questions? Thanks a lot.

Best Regards,
Sri
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