(Advanced analysis)The demand for commodity X is represented by the equation P = 10 - 0.2 Q and supply by the equation P = 2 + 0.2 Q. If demand changes from P = 10 - 0.2 Q to P = 7 - 0.3 Q, we can conclude that

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The original demand equation is P = 10 - 0.2 Q, and the new demand equation is P = 7 - 0.3 Q. The decrease in the intercept from 10 to 7 and the increase in the absolute value of the slope from 0.2 to 0.3 both indicate that at any given price, consumers now want to buy less of the commodity than before, which means demand has decreased.

(Advanced Analysis)The Demand for Commodity X Is Represented by the Equation