document.write( "Question 248124: I invested part of my 10,000 bonus in a cd that paid 6% interest and the rest in a fund that paid 11% interest. The total interest was 900, how much did invest in the fund? \n" ); document.write( "
Algebra.Com's Answer #180864 by tutorcecilia(2152)\"\" \"About 
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I invested part of my 10,000 bonus in a cd that paid 6% interest and the rest in a fund that paid 11% interest. The total interest was 900, how much did invest in the fund?
\n" ); document.write( "Use: x+y=c
\n" ); document.write( "So, x+y=10,000
\n" ); document.write( "y=10,000-x
\n" ); document.write( "and
\n" ); document.write( "Use: ax+by=total
\n" ); document.write( "So, .06x+.11y=900
\n" ); document.write( ".06x+.11(10,000-x)=900[substitute y=10,000-x)
\n" ); document.write( ".06x+1100-.11x=900
\n" ); document.write( ".06x-.11x=900-1100
\n" ); document.write( "-.05x=-200
\n" ); document.write( "-0.5x/.05=-200/-.05
\n" ); document.write( "x=4,000
\n" ); document.write( "Substituting: 4,000+y=10,000
\n" ); document.write( "y=6,000
\n" ); document.write( "answers: I invested $4,000 at 6% and invested $6,000 at 11%
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