1. The problem statement, all variables and given/known data Find the scalar equation of the plane containing the points A(-3, 1, 1) and B(-4, 0, 3) and the vector u = [1, 2, 3]. 2. Relevant equations I am at a lost, since I can't tell how to figure out the normal vector. I am supposed to find: Ax+By+Cz+D=0, where [A,B,C] is the normal vector. 3. The attempt at a solution I don't know. I can find the scalar equation of three separate points, but I am not sure here. Either I am not thinking about this the right way, or I am honestly lost.