Show that for any value of 
, the point having the form 
lies on the plane whose equation is 
.
Definitions:
Spot Exchange Rate
The current exchange rate at which a currency can be bought or sold for immediate delivery.
Forward Exchange Rate
An agreed-upon exchange rate for a currency transaction that will occur at a future date, used for hedging or speculation in foreign exchange markets.
Future Rate
The anticipated interest rate or currency exchange rate applicable to financial transactions that will occur in the future.
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