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Real-life problems often involve solving for a large number of variables.. The matrix inverse method turns out to be usually more efficient than the methods of substitution and elimination.. The graphical method does not apply when there are more than 2 variables.. As always, the first step is to se
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1. Applications of the matrix inverse method
11. a)
Invest $4,000, $1,000, and $5,000 at 6%, 7%, and 8%, respectively.
Invest $2,500, $2,500, and $5,000 at 6%, 7%, and 8%, respectively.
Just invest $5,000 at 7% and $5,000 at 8%, respectively.
There is no way of meeting the persons investment requirements for a return of $775.
b) At least $700 and at most $750