What is the matrix of the reflection at the line $y = x-2$?
How do I get the matrix at homogeneous coordinates? I don't get this question at all. I have really no idea of what I am supposed to do here or how. I did draw the line but then I don't know how to get a matrix from this information. Are there some particular steps to follow (like a cook recipe) ? Can someone explain me one step at a time? I just started with linear algebra which is why I don't know how to get this matrix.
I appreciate your help.