document.write( "Question 727145: x=y-4
\n" ); document.write( "3x+y=12
\n" ); document.write( "solve the linear system using substitution \n" ); document.write( "

Algebra.Com's Answer #444979 by MathLover1(20850) $\"\"$ $\"About$

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\n" ); document.write( " $\"x=y-4\"$ ....eq.1
\n" ); document.write( " $\"3x%2By=12\"$ ....eq.2
\n" ); document.write( "_________________________________
\n" ); document.write( "to solve the linear system using substitution, substitute value of $\"x\"$ from eq.1 in eq.2 \r
\n" ); document.write( "\n" ); document.write( " $\"3%28y-4%29%2By=12\"$ ....eq.2..solve for $\"y\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"3y-12%2By=12\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"3y%2By=12%2B12\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"4y=24\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"y=24%2F4\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"highlight%28y=6%29\"$ \r
\n" ); document.write( "\n" ); document.write( "go back to eq.1 and find $\"x\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x=y-4\"$ ....eq.1...plug in $\"y=6\"$ \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " $\"x=6-4\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"highlight%28x=2%29\"$ \r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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