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+// Example 11.1: Open-loop gain, Return ratio, Reverse transmission β of feedback circuit
+clc, clear
+// Let A be open-loop gain and B be return ratio
+// For A, B 10% higher, -1.1A + 55.11B = -50.1
+// For A, B 10% lower, -0.9A + 44.91B = -49.9
+// Solving the two equations
+a=[-1.1 55.11; -0.9 44.91];
+b=[-50.1; -49.9];
+c=inv(a)*b;
+A=c(1,1);
+B=c(2,1);
+disp(A,"Open-loop gain =");
+disp(B,"Return ratio =");
+disp(B/A,"Reverse transmission β of the feedback circuit =");
+\ No newline at end of file