Question: How do I use the utility function to find optimal demand function? Betty has $10 to spend each week on Coke (x) and Pepsi (y),
How do I use the utility function to find optimal demand function?

Betty has $10 to spend each week on Coke (x) and Pepsi (y), which are perfect substitutes for Betty. Betty's utility function for Coke and Pepsi can be represented as u (x, y) = x ty. A 12 ounce can of Coke costs $Px and a same size can of Pepsi costs $Py. What is Betty's optimal demand function for Pepsi
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