Final answer:
The production volume constraint for the two mobile phone models A and B, represented by x and y respectively, with a maximum daily production of 5,000 units in total is x + y ≤ 5,000.
Step-by-step explanation:
The question asks to represent the production volume constraint for two mobile phone models, A and B, with a daily manufacturing limit of 5,000 phones in total. If x represents the number of Model A phones and y represents the number of Model B phones produced daily, then the constraint can be represented by the inequality x + y ≤ 5,000. This equation shows that the total number of phones produced cannot exceed 5,000 units per day.