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GMAT Prep Geometry??

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GMAT Prep Geometry??

by dferm » Mon Apr 28, 2008 12:45 pm
If a and b are positive numbers, what are the coordinates of the midpoint of line segment CD in the xy-plane?

(1) The coordinates of C are (a, 1-b)
(2) The coordinates of D are (1-a, b)

Please Help...

Thanks..
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Source: — Data Sufficiency |
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by tmmyc » Mon Apr 28, 2008 3:47 pm
Point 1: (x1, y1)
Point 2: (x2, y2)
Midpoint: ( (x1+x2)/2 , (y1+y2)/2 )

Statement 1: No information about D.
Statement 2: No information about C.

Together:
( (a+1-a)/2 , (1-b+b)/2 ) = (1/2, 1/2)
Sufficient
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