document.write( "Question 274912: solve by substitution method\r
\n" ); document.write( "\n" ); document.write( "3x + 8y = 4
\n" ); document.write( "12y +6x = -1 \n" ); document.write( "

Algebra.Com's Answer #200567 by JBarnum(2146) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"3x%2B8y=4\"$
\n" ); document.write( " $\"12y%2B6x=-1\"$ $\"x=%28-1-12y%29%2F6\"$ $\"x=%28-1%2F6%29-2y\"$
\n" ); document.write( "plug x into the first equation
\n" ); document.write( " $\"3x%2B8y=4\"$
\n" ); document.write( " $\"3%28%28-1%2F6%29-2y%29%2B8y=4\"$
\n" ); document.write( " $\"%28-1%2F2%29-6y%2B8y=4\"$
\n" ); document.write( " $\"%28-1%2F2%29%2B2y=4\"$
\n" ); document.write( " $\"2y=4%2B%281%2F2%29\"$
\n" ); document.write( " $\"2y=8%2F2%2B%281%2F2%29\"$
\n" ); document.write( " $\"2y=9%2F2\"$
\n" ); document.write( " $\"highlight%28y=9%2F4%29\"$
\n" ); document.write( " $\"3x%2B8y=4\"$
\n" ); document.write( " $\"3x%2B8%289%2F4%29=4\"$
\n" ); document.write( " $\"3x%2B%2818%29=4\"$
\n" ); document.write( " $\"3x=-14\"$
\n" ); document.write( " $\"highlight%28x=-14%2F3%29\"$ \n" ); document.write( "

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