1. The problem statement, all variables and given/known data Determine the equation of the plane that contains the points A(1, 2, 3) and B(2, 3, -1) and is perpendicular to the plane 3x + y + z + 1=0. I think I know how to do it with only one point, not two 3. The attempt at a solution I know that v= normal so it would be (3, 1, 1). Then I could use point A and say (x-1, y-2, z-3)dot(3, 1, 1)=0 After expanding, I get 3x + y + z -8=0. Do I need to incorporate the other point?