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+//example no.3.9
+//solving the system using inverse of the cofficient matrix
+
+A=[1 1 1;4 3 -1;3 5 3]
+
+I=[1 0 0;0 1 0;0 0 1]
+
+b=[1 ;6 ;4]
+
+M=jorden(A,I)
+
+IA=M(1:3,4:6)
+
+X=IA*b
+