document.write( "Question 56380: please solve the system:
\n" ); document.write( "x+y=10
\n" ); document.write( "y=4x \n" ); document.write( "

Algebra.Com's Answer #38235 by Edwin McCravy(20056) $\"\"$ $\"About$

You can put this solution on YOUR website!

please solve the system:\r\n" );
document.write( "\r\n" );
document.write( "  x + y = 10\r\n" );
document.write( "      y = 4x\r\n" );
document.write( "\r\n" );
document.write( "The second equation is already solved for y so\r\n" );
document.write( "substitute 4x in place of y in the first:\r\n" );
document.write( "\r\n" );
document.write( "  x + y = 10\r\n" );
document.write( "\r\n" );
document.write( "Putting 4x where y is:\r\n" );
document.write( "\r\n" );
document.write( " x + 4x = 10\r\n" );
document.write( "1x + 4x = 10\r\n" );
document.write( "     5x = 10\r\n" );
document.write( "      x = 2\r\n" );
document.write( "\r\n" );
document.write( "Now substitute 2 for x in the equation y = 4x\r\n" );
document.write( "\r\n" );
document.write( "      y = 4x\r\n" );
document.write( "      y = 4(2)\r\n" );
document.write( "      y = 8\r\n" );
document.write( "\r\n" );
document.write( "So the solution is (x,y) = (2,8)\r\n" );
document.write( "\r\n" );
document.write( "Edwin

\n" ); document.write( "

\n" );