Linear Algebra, orthogonal

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The vector v lies in the subspace of R^3 and is spanned by the set B = {u1, u2}. Making use of the fact that the set B is orthogonal, express v in terms of B where,

v = 1
-2
-13

B = 1 1
2 , 1
3 -1

v is a matrix and B is a set of 2 matrices

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