document.write( "Question 355198: An executive invests $22,000, some at 7% and some at 5% annual interest. If he receives an annual return of $1420, how much is invested at each rate?
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Algebra.Com's Answer #253744 by Fombitz(32388) $\"\"$ $\"About$

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Let $\"A\"$ be the amount invested at 7%, $\"B\"$ the amount at 5%.
\n" ); document.write( "Total amount invested:
\n" ); document.write( "1. $\"A%2BB=22000\"$
\n" ); document.write( "Total interest obtained:
\n" ); document.write( "2. $\"7A%2B5B=142000\"$
\n" ); document.write( "Multiply eq. 1 by (-5) and add to eq. 2 to eliminate $\"B\"$ and solve for $\"A\"$ .
\n" ); document.write( " $\"-5A-5B%2B7A%2B5B=-110000%2B142000\"$
\n" ); document.write( " $\"2A=32000\"$
\n" ); document.write( " $\"highlight%28A=16000%29\"$
\n" ); document.write( "Then from eq. 1,
\n" ); document.write( " $\"16000%2BB=22000\"$
\n" ); document.write( " $\"highlight%28B=6000%29\"$ \n" ); document.write( "

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