Posted by **Brandon** on Monday, March 5, 2012 at 1:27pm.

The coordinates of the vertices of triangle CDE are C(1,4), D(3,6), and E(7,4). If the triangle is reflected over the line y=3, what are the coordinates of the image of D?

I think (3,-6), but not real sure.

- geometry -
**Steve**, Monday, March 5, 2012 at 2:36pm
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.

- geometry -
**lulabye**, Wednesday, February 18, 2015 at 10:44am
dats correct O: howd you know <3

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