Final answer:
To demonstrate a left axillary 6th rib fracture, the radiographer should position the patient upright and in a 45 degree LPO position.
Step-by-step explanation:
The radiographer should position the patient in an upright and 45 degree LPO (left posterior oblique) position to demonstrate a left axillary 6th rib fracture. In this position, the patient stands facing the observer with the upper limbs extended out at a ninety-degree angle from the torso and the lower limbs in a wide stance with feet pointing laterally.