If the quantity of soccer balls demanded is represented by the equation QD = 80 - 2P, then the corresponding price of soccer balls is represented by the equation
A) P = 1.6QD + 80.
B) P = 80 - QD.
C) P = 40 - 0.5QD.
D) P = QD + 160.

Question

Quizplus · Accepted Answer

To find the price equation, solve the demand equation QD = 80 - 2P for P. Rearranging gives P = (80 - QD) / 2, which simplifies to P = 40 - 0.5QD.

If the Quantity of Soccer Balls Demanded Is Represented by the Equation