Question 948381: Company A Spent a total of $11 million on advertising in fiscal year 2010, 2011, and 2012. The amount spent in 2012 was three times the amount spent in 2010. The amount spent in 2011 was $3 million less than the amount spent in 2012. How much was spent on advertising each year.
My attempt to set-up the system:
x + y + z = 11
y - z = 3
z = 3x
Answer by MathLover1(20850)   (Show Source):
You can put this solution on YOUR website! Company A Spent a total of $ million on advertising in fiscal year  , , and  .
your attempt to set-up the system was perfect, system just need to be solved
so,
in year company spent  million,
in year  company spent  million,
in year company spent  million,
total:  ........eq.1
The amount spent in was three times the amount spent in .
 ........eq.2
The amount spent in was $ million less than the amount spent in .
 ........eq.3
solve the system:
........eq.1
........eq.2
........eq.3
-----------------------------------------
start with ........eq.3 substitute  .......3a
go to
........eq.1 substitute  from eq.3a
 ...... solve for
go to  .......3a substitute 
go to ........eq.2 substitute 
so, each year on advertising was spent:
in year company spent  million,
in year company spent million,
in year  company spent  million,
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