Determine whether the function 
is a solution of the differential equation 
Definitions:
Demand for Money Schedule
A representation of the relationship between the quantity of money people wish to hold and the interest rate, other factors being constant.
Quantity of Money
The total amount of money in circulation or in existence within a particular economy.
Interest Rate
Interest Rate is the proportion of a loan that is charged as interest to the borrower, typically expressed as an annual percentage of the loan outstanding.
Credit Cards
Financial instruments issued by banks that allow holders to borrow funds at the point of sale, intended for short-term financing with the obligation of paying back the borrowed amount plus interest.
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