SOLUTION: I need help with this word problem, I don't know how to set up the system of linear equations. Any help would be appreciated. Thanks. Walt made an extra $9000 last year from a

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Question 143134: I need help with this word problem, I don't know how to set up the system of linear equations. Any help would be appreciated. Thanks.
Walt made an extra $9000 last year from a part-time job. He invested part of the money at a 9% annual rate of interest, and the rest at an 8% annual rate of interest. At the end of the year, he made a total of $770 in interest. How much was invested at 8%?
Answer by oscargut(2103) About Me  (Show Source):
You can put this solution on YOUR website!

You have to solve:
C1+C2=9000
0.09(C1)+0.08(C2)=770
And the value of C2 is the solution