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Supply and Demand for Widgets S D Question 3. (Supply and Demand) (11 points). For question 3, refer to the graphic, above, titled "Supply and Demand for Widgets." All prices shown on the line are multiples of 10, although only some quantities are multiples of 10. a) (3 points) Which line is the demand curve? Which line is the supply curve? How do you know? (I! necessary. explain any assumptions you make in order to answer this question confidently.) b) (2 points) Write an equation for the supply curve shown in this diagram. (Use the variables P and O, not x and y.) C) (2 points) Write an equation for the demand curve shown in this diagram. (Use the variables P and Q, not x and y.) d) (4 points) Find the equilibrium in the market shown in this diagram