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 x-coordinates 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 + (2-oldx)

eg A(-5,1) will become A'(2+(2+5),1) or A'(9,1)

Find B' and C', then add up the x-coordinates.

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