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+// Exa 3.9
+clc;
+clear;
+close;
+// Given data 
+R1= 10;// in kΩ
+R1=R1*10^3;// in Ω
+R2= 5;// in kΩ
+R2=R2*10^3;// in Ω
+RC= 1;// in kΩ
+RC=RC*10^3;// in Ω
+RE= 2;// in kΩ
+RE=RE*10^3;// in Ω
+V_CC= 15;// in V
+V_BE= 0.7;// in V
+// When
+I_C=0;
+V_CE= V_CC-I_C*(RC+RE);// in V
+// When V_CE= 0
+I_C= V_CC/(RC+RE);// in A
+V_B= V_CC*R2/(R1+R2);// in V
+I_E= (V_B-V_BE)/RE;// in A
+I_C= I_E;// in A (approx)
+I_CQ= I_C;// in A
+V_CE= V_CC-I_C*(RC+RE);// in V
+V_CEQ= V_CE;// in V
+V_CE= 0:0.1:15;// in Volt
+I_C= (V_CC-V_CE)/(RC+RE)*1000;// in mA
+plot(V_CE,I_C);
+title("DC load line")
+xlabel("V_CE in volts")
+ylabel("I_C in mA")
+disp("DC load line shown in figure")
+disp("Operating point is "+string(V_CEQ)+" V and "+string(I_CQ*10^3)+" mA")