Final answer:
The subject of this question is Mathematics. The demand curve equation is used to find the quantity supplied when the price is $2. The quantity supplied is 12 personal pizzas.
Step-by-step explanation:
The student is asking about the subject of the question. In this case, the subject is Mathematics. The question involves solving a demand curve equation and determining the quantity supplied when the price is $2. By using algebra or graphing techniques, we can find that the quantity supplied is 12 personal pizzas. This means that the quantity demanded is equal to the quantity supplied, as Qd = Qs.