A2 for testing A=LU by Gaussion Elimination and Back Substitution 3 2.0 -2.0 3.0 -2.0 3.0 -4.0 4.0 -3.0 7.0 Output matrices L and U are stored in the input matrix A 2.0000 -2.0000 3.0000 -1.0000 1.0000 -1.0000 2.0000 1.0000 2.0000 Matrices L, U for A=LU in [L U P=I]=lu(A)