SOLUTION: The total annual interest for two investments are $81. Some amount of this money is invested at 5% simple interest and $300 more was invested at 7% simple interest. How much was in

Question 935383: The total annual interest for two investments are $81. Some amount of this money is invested at 5% simple interest and $300 more was invested at 7% simple interest. How much was invested at each rate
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = amount invested at 5%
y = amount invested at 7%
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0.05x + 0.07y = 81
y = x + 300
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put the system of linear equations into standard form
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0.05x + 0.07y = 81
x - y = -300
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https://sooeet.com/math/system-of-linear-equations-solver.php
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solution:
x = amount invested at 5% = 500
y = amount invested at 7% = 800
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