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+//CHAPTER 1- D.C. CIRCUIT ANALYSIS AND NETWORK THEOREMS 
+//Example 15
+
+disp("CHAPTER 1");
+disp("EXAMPLE 15");
+
+//VARIABLE INITIALIZATION
+v=7;                            //voltage source in Volts
+I=7;                            //current source in Amperes
+r3=1;                           //in Ohms
+
+//SOLUTION
+//(1)I1+(-4)I2+(4)I3=7............eq (1)
+//(-1)I1+(6)I2+(-3)I3=0...........eq (2)
+//(1)I1+(0)I2+(-1)I3=7............eq (3)
+//solving the equations by matrix method
+A=[1 -4 4;-1 6 -3;1 0 -1];
+b=[7;0;7];
+x=inv(A)*b;
+I1=x(1,:);                      //to access the 1st element of 3X1 matrix
+I2=x(2,:);                      //to access the 2nd element of 3X1 matrix
+I3=x(3,:);                      //to access the 3rd element of 3X1 matrix
+vx=-(I3*r3);
+disp(sprintf("By Mesh analysis, the value of V_x is %d V",vx));
+
+//END