Find the coordinates of the symmetric point of the point M(3,4,7) from the plane 2x-y+z+9=0
The Attempt at a Solution
I found the equation of the plane which the symmetric point is staying at:
Also I found the distance between M(3,4,7) and the symmetric point:
I need one more condition to solve the system.
The coordinate from my text book results which I need to find is: [tex]M_s(-9,10,1)[/tex]