nag_dgtrfs (f07chc) Example Program Results Solution(s) 1 2 1 -4.0000 5.0000 2 7.0000 -4.0000 3 3.0000 -3.0000 4 -4.0000 -2.0000 5 -3.0000 1.0000 Backward errors (machine-dependent) 7.2e-17 5.9e-17 Estimated forward error bounds (machine-dependent) 1.4e-14 0.0e+00