Posted by Sam on Wednesday, December 19, 2007 at 9:50pm.
The coordinates of the vertices of triangle ABC are A (5,1), B (2,3) and C (4,7). The triangle is reflected over the line x=2. What is the sum of the xcoordinates of points A', B' and C'(the points after the reflection)?

Math  Reiny, Wednesday, December 19, 2007 at 11:32pm
The y values will not change,
the new x value will be 2 + (2oldx)
eg A(5,1) will become A'(2+(2+5),1) or A'(9,1)
Find B' and C', then add up the xcoordinates.
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