
Concept explainers
The amount invested in each type of bond by using the inverse of the coefficient matrix.

Answer to Problem 62E
Explanation of Solution
Given information:
The average yields are
Use the inverse of the coefficient matrix of this system to find the amount invested in each type of bond.
Calculation:
The given system of equation is:
Convert the augmented matrix into the row-echelon form by gauss elimination method:
Firstly find the pivot in the first column in the first row:
Multiply the first row by
Subtract the second row from the first row and multiply the second row by
Subtract the second row from the third row and restore it and make the pivot in the third column by dividing the third row by
Multiply the third row by
Multiply the third row by
Therefore, the solutions are
Chapter 8 Solutions
Precalculus with Limits
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