Solve the system by graphing. If the solution does not appear to be a lattice point, estimate the solution to the nearest tenth (indicate that your solution is an estimate). 
Definitions:
Value of Money
The purchasing power of money, indicating the amount of goods or services that one unit of money can buy, subject to change due to inflation or deflation.
Interest Rate
The percentage of an amount of money which is charged for its use per a certain period, often annually, by a lender to a borrower.
Medium of Exchange
A medium of exchange is anything widely accepted as a form of payment, making trade easier by eliminating the need for a coincidence of wants.
Store of Value
An asset, commodity, or currency that can be saved, retrieved, and exchanged in the future without significantly losing value.
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