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+448 Explain geometrically why (x,y,z)=(1,2,3)+s(1,1,1)+t(-2,-2,-2) is not the equation of a plane but rather the equation of a line. Show algebraically that this is the equation of a line (in the form (x,y,z)=(a1,a2,a3)+n(m1,m2,m3)
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