Reflection across a line
A line defines points of reflection
points are ubicated at same distance with respect to line x=1
X coordinate remains equal
Y coordinate varies acording to
y - 2 (y-1 )
Then now find y coordinates
For C , y = 3- 2•(3-1) = -1
For D , y = 4 - 2•(4-1) = -2
For E, y = 5 - 2•(5-1) = -3
For F, y= 4 - 2•(4-1) = -2
Then new coordinates C',D',E',F' are
C' = ( 4,-1)
D' = ( 9,-2)
E '= ( 4,-3)
F'= ( 1, -2)