document.write( "Question 320375: solve by elimination method\r
\n" ); document.write( "\n" ); document.write( "0.3x-0.2y=4
\n" ); document.write( "0.2x+0.54y=-3
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Algebra.Com's Answer #229482 by Fombitz(32388)\"\" \"About 
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0.3x-0.2y=4
\n" ); document.write( "0.2x+0.54y=-3
\n" ); document.write( "Multiply both equation by 100
\n" ); document.write( "1.\"30x-20y=400\"
\n" ); document.write( "2.\"20x%2B54y=-300\"
\n" ); document.write( "Multiply eq. 1 by 2 and eq. 2 by -3 and add them to eliminate x.
\n" ); document.write( "\"60x-40y-60x-162y=800%2B900\"
\n" ); document.write( "\"-202y=1700\"
\n" ); document.write( "\"highlight%28y=-850%2F101%29\"
\n" ); document.write( "Then from eq. 1,
\n" ); document.write( "\"30x-20%28-850%2F101%29=400\"
\n" ); document.write( "\"30x%2B17000%2F101=40400%2F101\"
\n" ); document.write( "\"30x=23400%2F101\"
\n" ); document.write( "\"highlight%28x=780%2F101%29\"
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