$(2)(8\%)$ Let line $L$ have a $y$ intercept $(0,b)$ and an angle of inclination $($with respect to the $x$

axis$).$ Describe the transformation $M$ which reflects an arbitrary point $P$ about a line $L($e$.$g$.,$

reflect $P$ to $P^{\text{'}}).$

Please answer with extreme detail, as if you're explaning to a little kid. Please do NOT give other answers previously put up because they are incorrect. If you do this, I will report your answer an account.

For a correct answer, i will upvote!