document.write( "Question 839243: An investment at 8% and some at 9% annual simple interest. The interest for 1 year on the combined investment of $10,000 was $840. How much was invested at each rate? Write a system of two equations in two variables to solve each problem. \n" ); document.write( "

Algebra.Com's Answer #505629 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
\n" );
document.write( "Hi,
\n" );
document.write( "Re: reply. One needs to solve the system of EQs by substitution to find x and y.
\n" );
document.write( "Write a system of two equations in two variables to solve each problem.
\n" );
document.write( "Let x and y represent amount saved at 8% and 9% respectively
\n" );
document.write( "    x  + y = $10,000    0r  x = $10,000 - y 
\n" );
document.write( " .08x + .09y = $840
\n" );
document.write( " .08(10,000 - y) + .09y = 840  |solving the system of EQs by substitution
\n" );
document.write( "             .01y = 840-800
\n" );
document.write( "              .01y = 40
\n" );
document.write( "                 y = $4000  and x = $6000 \n" );
document.write( "

\n" );