Let A be a square matrix. (a) Suppose that the homogeneous system Ax = 0 has a

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Let A be a square matrix.
(a) Suppose that the homogeneous system Ax = 0 has a nontrivial solution x = u. Show that u is an eigenvector of A?
(b) Suppose that 0 is an eigenvalue of A and v is an associated eigenvector. Show that the homogeneous system Ax = 0 has a nontrivial solution?
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