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**1. Homework Statement**

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?