document.write( "Question 741771: For the following system, if you isolated x in the first equation to use the Substitution Method, what expression would you substitute into the second equation?\r
\n" ); document.write( "\n" ); document.write( "−x + 2y = 9
\n" ); document.write( "4x + 5y = 9
\n" ); document.write( "

Algebra.Com's Answer #852626 by ikleyn(53419)\"\" \"About 
You can put this solution on YOUR website!
.
\n" ); document.write( "For the following system, if you isolated x in the first equation to use the Substitution Method,
\n" ); document.write( "what expression would you substitute into the second equation?\r
\n" ); document.write( "\n" ); document.write( "-x + 2y = 9
\n" ); document.write( "4x + 5y = 9
\n" ); document.write( "~~~~~~~~~~~~~~~~~~~~~~~~\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "
\r\n" );
document.write( "I isolate 'x' in the first equation by moving 'x' to the right side (with changing its sign)\r\n" );
document.write( "and moving '9' to the left side (with changing its sign)\r\n" );
document.write( "\r\n" );
document.write( "    2y - 9 = x.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Then precisely this expression I will substitute into the second equation, replacing 'x' there\r\n" );
document.write( "with 2y-9.\r\n" );
document.write( "
\r
\n" ); document.write( "\n" ); document.write( "Thus I answered your question.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "
\n" ); document.write( "
\n" );