Suppose that the relationship between price, P. and quantity, Q, is given by the equation Q = 140 4P. Which of the following equations correctly represents solving Q = 140 4P for P? O P= 140 + Q O P- 140 Q O P= 140 - 4Q O P= 35 - 4Q O P= 35 - Q Plot the relationship between Pand Q on the following graph. Note: Price (P) is on the vertical axis and quantity (Q) is on the horizontal axis. 40 + 35 30 25 15 10 10 15 20 25 30 35 40 QUANTITY The slope of this line is Suppose that the P in this equation refers to the price of a magazine subscription, and the Q refers to the number of magazine subscriptions sold. Read the following statement carefully: "When the price of a magazine subscription goes up, fewer people subscribe to the magazine." Which of the following best summarizes the pattern of causality suggested by this statement? O The relationship between Pand Q is not a causal relationship. O A change in Q causes a change in P. O A change in P causes a change in Q. PRICE 8