document.write( "Question 945142: Solve the system using substitution.
\n" ); document.write( "
\n" ); document.write( "y = 2x + 7
\n" ); document.write( "y = 5x + 4 \n" ); document.write( "

Algebra.Com's Answer #576312 by MathLover1(20850) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"y+=+2x+%2B+7\"$ ......eq.1
\n" ); document.write( " $\"y+=+5x+%2B+4\"$ ......eq.2
\n" ); document.write( "-----------------------------substitute $\"5x+%2B+4\"$ for $\"y\"$ in eq.1\r
\n" ); document.write( "\n" ); document.write( " $\"5x+%2B+4+=+2x+%2B+7\"$ ......eq.1...solve for $\"x\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"5x-2x+=+7-4\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"3x+=+3\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x+=+3%2F3\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"highlight%28x+=+1%29\"$ \r
\n" ); document.write( "\n" ); document.write( "go to $\"y+=+5x+%2B+4\"$ ......eq.2 substitute $\"1\"$ for $\"x\"$ and solve for $\"y\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"y+=+5%2A1+%2B+4\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"highlight%28y+=+9%29\"$ \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "

\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );