SOLUTION: Suppose you invest a certain amount of money in an account that earns 4% annual interest and $2000 more than that in an account that pays 5% annual interest. If the total interest

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Let x = the amount invested at 4% and x+$2000 = the amount invested at 5%.
The interest earned on these two amounts ($370) can be expressed by:
Simplify.
Combine the x-terms.
Subtract 100 from both sides.
Divide both sides by 0.09
and
$2,000 was invested at 4% and $5,000 was invested at 5%.