document.write( "Question 948955: y=4X+12
\n" ); document.write( "-4X+3y=21 \n" ); document.write( "

Algebra.Com's Answer #579254 by Fombitz(32388) $\"\"$ $\"About$

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Substitute from the first equation into the second.
\n" ); document.write( " $\"y=4X%2B12\"$
\n" ); document.write( " $\"4X=y-12\"$
\n" ); document.write( ".
\n" ); document.write( ".
\n" ); document.write( " $\"-%28y-12%29%2B3y=21\"$
\n" ); document.write( " $\"-y%2B12%2B3y=21\"$
\n" ); document.write( " $\"2y=9\"$
\n" ); document.write( " $\"y=9%2F2\"$
\n" ); document.write( "Then,
\n" ); document.write( " $\"4X=9%2F2-12\"$
\n" ); document.write( " $\"4X=9%2F2-24%2F2\"$
\n" ); document.write( " $\"4X=-15%2F2\"$
\n" ); document.write( " $\"X=-15%2F8\"$
\n" ); document.write( " \n" ); document.write( "

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