Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §11.2 Planes and Projections, #42 · Multivariable Calculus · Vectors & geometry

It takes three points to determine a plane

It takes three points to determine a plane. So why does $a x + b y + cz = d$ contain four numbers $a, b, c, d$ ? When does $e x + f y + g z = d$ represent the same plane?

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §11.2 Planes and Projections, #42

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