Final answer:
The variable x in the equation P = 3x + 1000 represents the number of cookies sold per week.
Step-by-step explanation:
In the equation P = 3x + 1000, where P represents the weekly profit of the bakery, x represents the number of cookies sold per week.
This is because the bakery makes $3 on each cookie, so the term 3x indicates the total earnings from cookies.
The $1000 added represents the weekly earnings from selling cups of coffee, which is a fixed amount regardless of the number of cups sold.