The line of reflection can be represented by the general equation of a line: y = mx + b, where: m= the slope of the line, b = the y-intercept (where the line crosses the y-axis).
A line of reflection is a straight line in the plane that splits a figure into two mirror images.
Any point on the line of reflection remains unchanged upon reflection.
Distances between corresponding points on either side of the line are equal. Angles between corresponding lines or segments are equal if measured from the reflection line. The line bisects perpendicular segments joining corresponding points on both sides.