SOLUTION: An investment of $2500 is made at an annual simple interest rate of 5.5%. How much additional money must be invested at an annual simple interest rate of 8% so that the total inter

Question 937225: An investment of $2500 is made at an annual simple interest rate of 5.5%. How much additional money must be invested at an annual simple interest rate of 8% so that the total interest earned is 7% of the total investment?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = amount invested at 5.5%
y = amount invested at 8%
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x = 2500
0.055x + 0.08y = 0.07*(2500 + y)
0.055x + 0.08y = 0.07*2500 + 0.07y
0.055x + 0.01y = 175
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put the system of linear equations into standard form
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x = 2500
0.055x + 0.01y = 175
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copy and paste the above standard form linear equations in to this solver:
https://sooeet.com/math/system-of-linear-equations-solver.php
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solution:
x = amount invested at 5.5% = 2500
y = amount invested at 8% = 3750
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