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diff --git a/29/CH9/EX9.9.1.a/exa9_9_1_a.sce b/29/CH9/EX9.9.1.a/exa9_9_1_a.sce
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+++ b/29/CH9/EX9.9.1.a/exa9_9_1_a.sce
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+//caption:check_for_observability_of_system
+//example 9.9.1_a
+//page 383
+A=[0 1;-2 -3]
+B=[0;1]
+C=[1 1]
+P=obsv_mat(A,C);
+disp(P,"Observability Matrix=");
+d=determ(P)
+if d==0
+  printf("matrix is singular, so system is unobservable");
+else
+  printf("system is observable");
+end;
+\ No newline at end of file