SOLUTION: nancy invested $6,000 some at 5% and some at 9% annual interest. if her combined annual interest is $400, find the amount in each account.

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Question 609836: nancy invested $6,000 some at 5% and some at 9% annual interest. if her combined annual interest is $400, find the amount in each account.
Answer by flame8855(424) About Me  (Show Source):
You can put this solution on YOUR website!
0.05x + 0.09y = 400
x+y=6000
5x+9y=40000
-5x-5y=-30000
4y=10000
y= 2500 at 5 %
x = 3500 at 9 %