1. The problem statement, all variables and given/known data Find an equation of the plane that passes through the point (-1,2,1) and contains the line of intersection of the planes x + y - z = 2 and 2x - y + 3z = 1 2. Relevant equations Equation of a plane: a(x-x0) + b(y-y0) + c(z-z0) = 0 3. The attempt at a solution n1 = <1,1,-1> n2 = <2,-1,3> n1[tex]\times[/tex]n2 = <2,-5,-3> = <a,b,c> Equation: 2(x+1) - 5(y-2) - 3(z-1) = 0 2x - 5y - 3z = -15 What am I doing wrong? Any help is appreciated.