SOLUTION: After inheriting some money, a woman wants to invest enough to have an annual income of $5,000. If she can invest $20,000 at 9% annual interest, how much more would she have to inv

Question 943601: After inheriting some money, a woman wants to invest enough to have an annual income of $5,000. If she can invest $20,000 at 9% annual interest, how much more would she have to invest at 7% to achieve her goal?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = amount invested at 7%
y = amount invested at 9%
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0.07x + 0.09y = 5000
y = 20000
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put the system of linear equations into standard form
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0.07x + 0.09y = 5000
y = 20000
---
copy and paste the above standard form linear equations in to this solver:
http://sooeet.com/math/system-of-linear-equations-solver.php
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solution:
x = 45714.286
y = 20000
---
answer:
x = 45714.29
y = 20000.00
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