... order matters V, W, U vector spaces v, w vectors 0, 0 V zero vector, zero vector of V B, D bases E n = e 1 , . . . , e n standard basis for R n β, δ basis vectors Rep B (v) matrix ... unique solution then they contribute to its value). But −(cb/a) + d = (ad− bc)/a and a fraction is not equal to 0 if and only if its numerator is not equal to 0. This, in this first case, there ... Three.VI.3: Projection Into a Subspace . . . . . . . . . . . . . . . . . . . . . 137 Topic: Line of Best Fit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143 Topic: Geometry...