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+//Example 2.3<v>
+//Check whether the following signal is linear or not.
+clear;
+close;
+clc;
+T=20;//length of the signal
+A=5;
+B=4;
+for n=1:T
+    x(n)=n;
+    y(n)=A*x(n)+B;
+end
+x1=x;
+y1=y;
+for n=1:T
+    x2(n)=2;y2(n)=A*x2(n)+B;
+end
+z=y1+y2;
+for n=1:T
+    y3(n)=A*(x1(n)+x2(n))+B;
+end
+if z==y3 then
+    disp('The following signal is linear');
+else 
+    disp('The following signal is non linear');
+end
+//Example 2.3<vi>
+//Check whether the following signal is linear or not.
+clear;
+close;
+clc;
+T=20;//length of the signal
+x1(1)=1;
+x2(1)=2;
+for n=2:T
+    x1(n)=n;
+    x2(n)=2*n;
+    y1(n)=(2*(x1(n)))+(1/x1(n-1));
+    y2(n)=(2*(x2(n)))+(1/x2(n-1));
+end
+z=y1+y2;
+for n=2:T
+   y3(n)=(2*(x1(n)+x2(n)))+(1/(x1(n-1)+x2(n-1)));
+end
+if z==y3 then
+    disp('The following signal is linear');
+else 
+    disp('The following signal is non linear');
+end
+//Example 2.3<vii>
+//Check whether the following signal is linear or not.
+clear;
+close;
+clc;
+T=20;//length of the signal
+for n=1:T
+    x(n)=n;
+    y(n)=n*x(n);
+end
+x1=x;
+y1=y;
+for n=1:T
+    x2(n)=2;y2(n)=n*x2(n);
+end
+z=y1+y2;
+for n=1:T
+    y3(n)=n*(x1(n)+x2(n));
+end
+if z==y3 then
+    disp('The following signal is linear');
+else 
+    disp('The following signal is non linear');
+end