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Coin Word Problem, Solving by Substitution

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Description
This paper provides the steps needed to solve a word problem involving a system of two linear equations.  The solution uses the substitution method.  The problem is a type called a "coin problem":
 
Brittany has 33 coins in nickels and dimes. The total value of the coins is $2.10.
How many coins of each type does Brittany have?