Question 1123101
.
<pre>
Let x = how much he invested at 4.5%.


Then his investment in bonds is 2x dollars,  and the rest is  10000-x -2x = (10000-3x) dollars.


Finally, the interest equation is


    0.045*x + 0.05*(2x) + 0.04*(10000-3x) = 455.


Simplify and solve for x.


Then evaluate (2x) and (10000-3x) as other investments.
</pre>

-----------------


That is all.


It is how this problem &nbsp;MUST &nbsp;be solved.


Matrices are &nbsp;IRRELEVANT &nbsp;in this case.


This problem is to solve it using one single unknown and one single equation.


---------------------


If you want to see other similar solved problems, &nbsp;look into the lessons

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/equations/More-complicated-word-problems-to-solve-using-single-linear-equation.lesson>More complicated word problems to solve using a single linear equation</A> 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/equations/Advanced-word-problems-to-solve-by-reduction-to-single-linear-equation.lesson>Advanced word problems to solve using a single linear equation</A>

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/equations/HOW-TO-algebreze-and-solve-these-problems-using-one-eqn-in-one-unknown.lesson>HOW TO algebreze and solve these problems using one equation in one unknown</A> 

in this site.