The variables x and y satisfy the equation x n y = C, where n and C

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The variables x and y satisfy the equation xny = C, where n and C are constants.

When x = 1.10, y = 5.20, and when x = 3.20, y = 1.05.

i. Find the values of n and C.
ii. Explain why the graph of ln y against ln x is a straight line.

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