I was given a question in an exam where it asked to get the reflection of a line through the points (6,2) and (4,1).

I know you have to translate it to the origin then rotate it to lie on the origin and then reflect it but I dont know how to get the translation vector, and also unsure of how to get the angle of rotation to the axis before i reflect it( i think it could be tan inverse of the slope??)

thanks in advance