The problem statement asks to find the voltage across a 5 ohm resistor in a circuit with a 10V voltage source and a 3 ohm resistor in series, and a 4 ohm resistor in parallel with the 3 ohm resistor.
The first step is to redraw the circuit, simplifying it by combining the parallel resistors into one equivalent resistor.
We use the formula 1/Req = 1/R1 + 1/R2 + ... + 1/Rn, where Req is the equivalent resistance and R1 to Rn are the individual resistances in parallel.
The next step is to use Ohm's law, V = IR, to find the current flowing through the circuit.
Using Ohm's law again, we can find the voltage across the 5 ohm resistor by multiplying the current found in the previous step with the resistance of the 5 ohm resistor.