15. Graphs of equations with two variables

Suppose that the relationship between price, P, and quantity, Q, is given by the equation Q) = 60 - 4P. Which of the following equations correctly represents solving Q = 60 - 4P for P? P = 60 - Q O P = 60 + Q O P = 60 - 4Q O P = 15 - -Q O P = 15- 4QPlot the relationship between P and Q on the following graph. Note: Price (P) is on the vertical axis and quantity (Q) is on the horizontal axis. (? O 36 26 PRICE 16 10 16 25 30 25 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 A change in Q causes a change in P. A change in P causes a change in Q. The relationship between P and Q is not a causal relationship