SOLUTION: A chemist wishes to make 3 liters of a 7% acid solution by mixing a 9% acid solution and a 4% acid solution. How many liters of each solution should the chemist use?

Question 926059: A chemist wishes to make 3 liters of a 7% acid solution by mixing a 9% acid solution and a 4% acid solution. How many liters of each solution should the chemist use?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = liters of 9%
y = liters of 4%
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9x + 4y = 7*3
x + y = 3
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put the system of linear equations into standard form
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9x + 4y = 21
x + y = 3
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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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answer:
x = liters of 9% = 1.8
y = liters of 4% = 1.2
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Solve and graph linear equations:
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Solve quadratic equations, quadratic formula:
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Solve systems of linear equations up to 6-equations 6-variables:
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