document.write( "Question 952455: 12x+6y=120\r
\n" ); document.write( "\n" ); document.write( "4x+y=30 \n" ); document.write( "

Algebra.Com's Answer #581674 by MathLover1(20850) $\"\"$ $\"About$

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\n" ); document.write( " $\"12x%2B6y=120\"$ ....eq.1.....simplify;divide both sides by $\"3\"$
\n" ); document.write( " $\"4x%2By=30\"$ .......eq.2
\n" ); document.write( "---------------------------
\n" ); document.write( " $\"4x%2B2y=40\"$ ....eq.1
\n" ); document.write( " $\"4x%2By=30\"$ .......eq.2
\n" ); document.write( "------------------------------subtract\r
\n" ); document.write( "\n" ); document.write( " $\"4x%2B2y-4x-y=40-30\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"2y-y=10\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"highlight%28y=10%29\"$ \r
\n" ); document.write( "\n" ); document.write( "go to $\"4x%2By=30\"$ .......eq.2, substitute $\"10\"$ for $\"y\"$ and solve for $\"x\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"4x%2B10=30\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"4x=30-10\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"4x=20\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x=20%2F4\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"highlight%28x=5%29\"$ \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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