1. The problem statement, all variables and given/known data Find a plane through the origin that meets the plane M : 2x + 3y + z = 12 in a right angle. How do you know your plane is perpendicular to M? 2. Relevant equations Honestly have no idea... I know how to find an equation for a plane given a normal and a point, however. 3. The attempt at a solution All I really know is that the normal of M, which is the perpendicular vector, would be <2,3,1>?