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GMAT Coordinate Geometry http://www.800score.com/forum/viewtopic.php?f=3&t=59 
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Author:  questioner [ Sun Aug 22, 2010 1:19 pm ] 
Post subject:  GMAT Coordinate Geometry 
The two lines y = x and x = 4 intersect on the coordinate plane. What is the value of the area of the figure formed by the intersecting lines and the xaxis? A. √(46)/3 B. 4√2 C. 8 D. 8√2 E. 16 (C) The lines intersect at the point (4, 4) and form a right triangle whose base length and height are both equal to 4. As you know, the area of a triangle is equal to one half the product of its base length and height: A = (1/2) × bh = (1/2) × (4 × 4) = 8 So the area is 8. The correct answer is C.  Hi, is there a pictorial representation of the triangle that is formed from the above equation? Thanks. 
Author:  Gennadiy [ Sun Aug 22, 2010 1:30 pm ]  
Post subject:  Re: GMAT Coordinate Geometry  
Here it is: Triangle ABC is the right triangle (angle ABC = 90 degrees). AB = 4 BC = 4

Author:  questioner [ Tue Nov 09, 2010 5:22 pm ] 
Post subject:  Re: GMAT Coordinate Geometry 
Hello, Based on the information in the stem, to me, the figure that is formed is a square and not a triangle. Since x = 4 forms a straight line parallel to the xaxis and y = x, which translates to y = 4 forms a straight line parallel to the y axis. They both meet at the coordinate (4.4), but again, using the xaxis, x = 4 and y = 4 the shape is that of a square not a triangle. Am I missing something? 
Author:  Gennadiy [ Tue Nov 09, 2010 5:35 pm ]  
Post subject:  Re: GMAT Coordinate Geometry  
THE PROPER PICTURE for the question is posted above in this topic. Note, that the line x = 4 is parallel to the yaxis and crosses the xaxis at the point (4, 0). The line y = x and the line y = 4 are different lines. These two lines cross at the point (4, 4), which happens to be the crossing point of the lines y = x and x = 4 as well. The following picture demonstrates that the lines y = x and y = 4 are different: THE PROPER PICTURE for the question is posted above in this topic.

Author:  questioner [ Wed Jan 12, 2011 5:39 pm ] 
Post subject:  Re: GMAT Coordinate Geometry 
Thank you very much! 
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