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Suppose that consumer uses 3 units of X and 4 units of Y always in fixed proportion. Then. what would be the demand function for X? where P. denotes price of good X and I denotes income. 3P x 31 O 4PX+3PY where Px and Py denote prices of goods X and Y and I denotes income. 3Pyl where Px and Py denote prices of goods X and Y and I denotes income. 4P x 31 O where Px and Py denote prices of goods X and Y and I denotes income. 3P x+4PY