Posted by Brandon on Monday, March 5, 2012 at 1:27pm.
think of folding the diagram on the line y=3. x-values don't change, and y-values are moved the same distance from the line y=3.
The distance of (x,y) from (x,3) is y-3.
so, (x,y) --> (x,3-(y-3)) = (x,6-y)
(3,6) --> (3,0)
D is 3 units above the line y=3, so it moves to 3 units below the line, or y=0.
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