SOLUTION: Mr. Ang invested Php 16,000, a part of it at 9% and he rest at 4%, his total interest from at both investments was Php 900. How much did he invest at each rate?

Question 929939: Mr. Ang invested Php 16,000, a part of it at 9% and he rest at 4%, his total interest from at both investments was Php 900. How much did he invest at each rate?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = amount invested at 9%
y = amount invested at 4%
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x + y = 16000
0.09x + 0.04y = 900
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put the system of linear equations into standard form
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x + y = 16000
0.09x + 0.04y = 900
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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 9% = 5200
y = amount invested at 4% = 10800
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