Question: Let a, b, c, d be real matrix numbers. Use Gaussian elimination to reduce the matrix to upper triangular form. For which choices of a,

Let a, b, c, d be real matrix numbers. Use Gaussian elimination to reduce the matrix to upper triangular form. For which choices of a, b, c, d is it true that Ax = y has a solution for every ? R^4?

Matrix:

a a a a a bb b A = a a c d

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