Please help with this Matlab problem

Consider the circuit diagram below I. R, R, Here, each V represents a change in voltage (in volts) at a battery, each R represents a resistance (in ohms) at a resistor and each I represents a current in amps) through a wire. These quantities obey two simple laws (1) Ohm's law: The voltage drop across a resistor is V IR (2) Kirchhoff's second law: The sum of all the volage changs in a closed loop is zero Using these two laws, we can construct the following system of equations: Hell + R1(11-12) + R2(11-13) = Vi, Rs13 + R4(13-12) + R2(13-11) = Va. Consider the circuit diagram below I. R, R, Here, each V represents a change in voltage (in volts) at a battery, each R represents a resistance (in ohms) at a resistor and each I represents a current in amps) through a wire. These quantities obey two simple laws (1) Ohm's law: The voltage drop across a resistor is V IR (2) Kirchhoff's second law: The sum of all the volage changs in a closed loop is zero Using these two laws, we can construct the following system of equations: Hell + R1(11-12) + R2(11-13) = Vi, Rs13 + R4(13-12) + R2(13-11) = Va