Final answer:
The cost per orange is $0.33, calculated by the equation Y = 1/3x, representing a constant rate of change in the price per quantity of oranges.
Step-by-step explanation:
The question is asking to determine the cost per orange when six oranges are sold for two dollars and provided that there is a constant rate of change represented by the equation Y = 1/3x. The equation means that for each unit increase in x (the number of oranges), Y (the total cost) increases by 1/3 of a dollar, or 33.33 cents. Therefore, since one orange is the unit we are considering, multiplying the quantity (x) of one orange by the rate ($1/3) gives us the cost per orange, which is $0.33 (or 33.33 cents).