Given
A = (1, 3)
B = (2, -1)
C = (-4, 1)
Reflected over x = 2
(1) the y-coordinate is unaffected.
(2) for reflections, the distance from the line of reflection to the object is equal to the distance to the image point.
A' = (3, 3)
B' = (2, -1)
C' = (8, 1)
