Final answer:
The equation for the relationship between the time Kathleen spends unloading the truck and the number of boxes she unloads is y = 6x.
Step-by-step explanation:
In a proportional relationship, there is a constant ratio between the two variables. In this case, the time (in minutes) Kathleen spends unloading the truck, x, and the number of boxes she unloads from the truck, y, have a proportional relationship.
We are told that in 1 minute, Kathleen unloads 6 boxes from the truck. This means that for every 1 minute, the number of boxes unloads increases by 6.
Therefore, the equation for the relationship between x and y is y = 6x. For every x minutes, Kathleen unloads 6x boxes.