Here's the question:

Find the scalar equation of the plane through the pointsM(1,2,3)andN(3,2,-1)that is perpendicular to the plane with equation3x + 2y + 6z +1 = 0.

Now I know that the normal to the given plane (3,2,6) should be perpendicular to the normal of the required plane but after that, I don't know how to proceed.

Any help would be much appreciated.

Thanks,

Dudeface