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+//Scilab Code for Example 7.1 of Signals and systems by
+//P.Ramakrishna Rao
+clc;
+clear;
+a0=2;
+a1=2;
+a2=4;
+x1=[1,3,5,7];
+x2=[2,4,6,8];
+for t=1:4
+    y1(1,t)=a0+a1*x1(t)+a2*(x1(t))^2;
+    y2(1,t)=a0+a1*x2(t)+a2*(x2(t))^2;
+end
+b1=2;
+b2=3;
+x=b1*x1+b2*x2;
+disp('y(n) does not depend on past inputs');
+disp('Hence the system is Static');
+disp(x,'The input to the system is:');
+for t=1:4
+    q(1,t)=a0+a1*x(t)+a2*(x(t))^2;
+end
+disp(q,'This input gives the output:');
+y=b1*y1+b2*y2;
+disp(y,'For the system to be linear the output should be:');
+disp('Hence the system is not linear');