SOLUTION: What formula do I use to solve the following: Linda invested a certain amount of money @ 8% yearly interest and $200 more than that @ 9% yearly interest. Her total interest for a y

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Question 462264: What formula do I use to solve the following: Linda invested a certain amount of money @ 8% yearly interest and $200 more than that @ 9% yearly interest. Her total interest for a year from the two investments was $188. How much did she invest @ 8%?
Answer by lwsshak3(11628) About Me  (Show Source):
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What formula do I use to solve the following: Linda invested a certain amount of money @ 8% yearly interest and $200 more than that @ 9% yearly interest. Her total interest for a year from the two investments was $188. How much did she invest @ 8%?
..
let x=$ invested at 8%
x+200=$ invested at 9%
.08x+.09(x+200)=188
.08x+.09x+18=188
.17x=170
x=170/.17=1000
ans:
Linda invested $1000 at 8% and 1000+200=$1200 at 9%