document.write( "Question 667675: Walt made an extra $5000 last year from a part time job. He invested part of the money at 8% and the rest at 9%. He made a total of $440 in interest. How much was invested at 9%? \n" ); document.write( "
Algebra.Com's Answer #415130 by mananth(16946)\"\" \"About 
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Part I 8.00% per annum ------------- Amount invested =x
\n" ); document.write( "Part II 9.00% per annum ------------ Amount invested = y
\n" ); document.write( " 5000
\n" ); document.write( "Interest----- 440
\n" ); document.write( "
\n" ); document.write( "Part I 8.00% per annum ---x
\n" ); document.write( "Part II 9.00% per annum ---y
\n" ); document.write( "Total investment
\n" ); document.write( "x + 1 y= 5000 -------------1
\n" ); document.write( "Interest on both investments
\n" ); document.write( "8.00% x + 9.00% y= 440
\n" ); document.write( "Multiply by 2
\n" ); document.write( "8 x + 9 y= 44000.00 --------2
\n" ); document.write( "Multiply (1) by -8
\n" ); document.write( "we get
\n" ); document.write( "-8 x -8 y= -40000.00
\n" ); document.write( "Add this to (2)
\n" ); document.write( "0 x 1 y= 4000
\n" ); document.write( "divide by 1
\n" ); document.write( " y = 4000
\n" ); document.write( "Part I 8.00% $ 1000
\n" ); document.write( "Part II 9.00% $ 4000
\n" ); document.write( "
\n" ); document.write( "CHECK
\n" ); document.write( "1000 --------- 8.00% ------- 80.00
\n" ); document.write( "4000 ------------- 9.00% ------- 360.00
\n" ); document.write( "Total -------------------- 440.00 \r
\n" ); document.write( "\n" ); document.write( "$4000 @ 9%
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\n" ); document.write( "m.ananth@hotmail.ca
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