The line l1 has vector equation r = (2, -1, 2) + lambda(4, -3, 4) The plane pi has equation r dot (1, -1, -1) =4.
The line l2 is the reflection of line l1 in the plane pi
Find a vector equation of the line l2
I've managed to find what M is and checked this against the mark scheme, but am unsure where (4, -3, 0) comes from and can't seem to end up with a direction vector in the same ratio as the answer
Mark scheme (Q 12): https://www.activeteachonline.com/default/player/document/id/721195/external/0/uid/357726