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Suppose that a there are two goods, X and Y. The price of Good X is $10 and the price of Good Y is $4. The seller of Good X offers a deal where if a consumer buys 1 unit of Good X they pay full price, but the second unit of Good X is only $8. Calculate the slope of the budget constraint between 1 unit of Good X and 2 units of Good X. (Remember to include a negative sign. Round to the nearest two decimal places if necessary.)