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+//Example 1.25(d)
+//To check whether the given discrete system is a Linear System (or) Non-Linear System y[n])= 2*x[n]-3
+clear;
+clc;
+x1=[1,1,1,1];
+x2=[2,2,2,2];
+a=1;
+b=1;
+for n=1:length(x1)
+x3(n)=a*x1(n)+b*x2(n);
+end
+for n=1:length(x1)
+y1(n)=2*x1(n)-3;
+y2(n)=2*x2(n)-3;
+y3(n)=2*x3(n)-3;
+end
+for n=1:length(y1)
+z(n)=a*y1(n)+b*y2(n);
+end
+count=0;
+for n=1:length(y1)
+if(y3(n)==z(n))
+count=count+1;
+end
+end
+if(count==length(y3))
+disp('Since It satisifies the superposition principle')
+disp('The given system is a Linear system')
+else
+disp('Since It does not satisify the superposition principle')
+disp('The given system is a Non-Linear system')
+end