document.write( "Question 154181: 2x+3y=21
\n" ); document.write( "-3x-6y=-24 \n" ); document.write( "

Algebra.Com's Answer #113497 by Alan3354(69443) $\"\"$ $\"About$

You can put this solution on YOUR website!
2x+3y=21 eqn 1
\n" ); document.write( "-3x-6y=-24 eqn 2
\n" ); document.write( "----------
\n" ); document.write( " 4x+6y=42 eqn 1 doubled
\n" ); document.write( "Add
\n" ); document.write( "x + 0y = 18
\n" ); document.write( "x = 18
\n" ); document.write( "Sub for x in eqn 1
\n" ); document.write( "2*18 + 3y = 21
\n" ); document.write( "36 + 3y = 21
\n" ); document.write( "3y = -15
\n" ); document.write( "y = -5 \n" ); document.write( "

\n" );