Question 827554: Justin has some nickels and dimes. He has a total of 30 coins with a value of $1.45. How many of each type of coin does he have? Answer by TimothyLamb(4379) (Show Source):
You can put this solution on YOUR website! ---
x = nickels
y = dimes
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x + y = 30
5x + 10y = 145
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solution:
x = nickels = 31
y = dimes = -1
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system matrix
1 1
5 10
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inverse of system matrix
2 -0.2
-1 0.2
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determinant of system matrix = 5
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