A' = (-1, -2)
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A line of reflection and a line of symmetry both show the reverse of an image.
The line of reflection is the perpendicular bisector of any point and its image.
Draw a line joining a point and its image and find its midpoint. Repeat for another pair of point and its image. The line joining these midpoints is the line of reflection.
A reflection is when you "flip" an image over a line on your graph. A translation is when you move your image vertically and/or horizontally.
It is a line of symmetry or a reflection on the Cartesian plane that produces a mirror image.