Mahdu views Coke, \(q\), and Pepsi as perfect substitutes: He is indifferent as to which one he drinks. The price of a 12-ounce can of Coke is \(p\), the price of a 12-ounce can of Pepsi is \(p^{*}\), and his weekly cola budget is \(Y\). Derive Mahdu's demand curve for Coke using the method illustrated in Figure 5.1.

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(a) Indifference Curves and Budget Constraints 12.0 Wine, Gallons per year 5.2 23 4.3 28 ........ Price-consumption curve -12 L' (P= $12) L (Pb = $6) L (P= $4) 26.7 44.5 58.9 Beer, Gallons per year (b) Demand Curve P. $ per unit 120 6.0 4.0 N D', Demand for beer 26.7 44.5 58.9 Beer, Gallons per year