document.write( "Question 280227: 0.3x-0.2y=4, 0.4x+0.5y= -55/17, What is the solution of the system. Use integers or fractions. \n" ); document.write( "
Algebra.Com's Answer #203672 by checkley77(12844)\"\" \"About 
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0.3x-0.2y=4 multiply by 5
\n" ); document.write( "0.4x+0.5y=-55/17 multiply by 2 & add.
\n" ); document.write( "1.5x-y=20
\n" ); document.write( ".8x+y=110/17
\n" ); document.write( "--------------------
\n" ); document.write( "2.3x=20+110/17
\n" ); document.write( "2.3x=(20*17+110)/17
\n" ); document.write( "2.3x=(340+110)/17
\n" ); document.write( "2.3x=450/17 cross multiply.
\n" ); document.write( "2.3x*17=450
\n" ); document.write( "39.1x=450
\n" ); document.write( "x=450/39.1
\n" ); document.write( "x=11.51 ans
\n" ); document.write( ".3*11.51-.2y=4
\n" ); document.write( "3.453-.2y=4
\n" ); document.write( "-.2y=4-3.453
\n" ); document.write( "-.2y=.547
\n" ); document.write( "y=.547/-.2
\n" ); document.write( "y=-2.735 ans.
\n" ); document.write( "Proof:
\n" ); document.write( ".4*11.51+.5*-2.735=-55/17
\n" ); document.write( "4.604-1.367=-55/17
\n" ); document.write( "-3.236~-3.235\r
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