SOLUTION: Wallt has three investments totaling $120,000. These investments earn interest at 4%, 6%, and 8% respectively. Walt's total income from these investments is $7,600. The income from

Question 934396: Wallt has three investments totaling $120,000. These investments earn interest at 4%, 6%, and 8% respectively. Walt's total income from these investments is $7,600. The income from the 8% investment exceeds the total income from the other two investments by $400. Find out how much Walt has invested at 6%
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = amount invested at 4%
y = amount invested at 6%
z = amount invested at 8%
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x + y + z = 120000
0.04x + 0.06y + 0.08z = 7600
0.08z = 0.04x + 0.06y + 400
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put the system of linear equations into standard form
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x + y + z = 120000
0.04x + 0.06y + 0.08z = 7600
0.04x + 0.06y - 0.08z = -400
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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 4% = 30000
y = amount invested at 6% = 40000
z = amount invested at 8% = 50000
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