document.write( "Question 836349: The annual interest on a $6000 investment exceeds the interest earned on a $5000 investment by $70. The $6000 is invested at a 0.5% higher rate of interest than the $5000. What is the interest rate of each investment \n" ); document.write( "
Algebra.Com's Answer #504147 by mananth(16946)\"\" \"About 
You can put this solution on YOUR website!

\n" ); document.write( "The annual interest on a $6000 be x
\n" ); document.write( "interest earned on a $5000be y\r
\n" ); document.write( "\n" ); document.write( "x-y=70...................(1)\r
\n" ); document.write( "\n" ); document.write( "rate of interest than the $5000. is (100/5000)y% = y/50 %
\n" ); document.write( "The $6000 is invested at a 0.5% rate of interest = (100/6000)x= x/60%\r
\n" ); document.write( "\n" ); document.write( "x/60 % - y/50 % = 0.5\r
\n" ); document.write( "\n" ); document.write( "multiply by 100\r
\n" ); document.write( "\n" ); document.write( "5x/3 -2y= 50
\n" ); document.write( "5x-6y=150..................(2)
\n" ); document.write( "x - y = 70 .............1
\n" ); document.write( "Total value
\n" ); document.write( "5 x -6 y = 150 .............2
\n" ); document.write( "Eliminate y
\n" ); document.write( "multiply (1)by -6
\n" ); document.write( "Multiply (2) by 1
\n" ); document.write( "-6 x 6 y = -420
\n" ); document.write( "5 x -6 y = 150
\n" ); document.write( "Add the two equations
\n" ); document.write( "-1 x = -270
\n" ); document.write( "/ -1
\n" ); document.write( "x = 270
\n" ); document.write( "plug value of x in (1)
\n" ); document.write( "1 x -1 y = 70
\n" ); document.write( "270 -1 y = 70
\n" ); document.write( " -1 y = 70 -270
\n" ); document.write( " -1 y = -200
\n" ); document.write( " y = 200 \r
\n" ); document.write( "\n" ); document.write( "On 6000 he gets 270
\n" ); document.write( "which is 4.5%\r
\n" ); document.write( "\n" ); document.write( "On 5000 he gets 200
\n" ); document.write( "which is 4%\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "
\n" ); document.write( "
\n" );