Line Reflection

Line r is the line y = x and the line of reflection. Line b is reflected over line r to produce line b'. What happens to the slope of b' in relationship to line b?
What is the equation of lines b and b'? Compare the two equations.

Try this: Can you produce line b' from line b with another transformation?

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Holly Phelps, August 7, 2008, Created with GeoGebra