Determine whether y is a function of x.
Definitions:
Euro
The official currency of the eurozone, which is used by 19 of the 27 European Union countries.
Net Exports
The value of a country's total exports minus its total imports, measuring the net trade of goods and services with other economies.
Nominal Exchange Rate
The rate at which one country's currency can be traded for another country's currency.
Yuan
The currency unit of the People's Republic of China, often used to denote the basic monetary unit.
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