document.write( "Question 441827: 12x + 7y = 19 and 4x - y = 3 then what is the value of 8x + 8y? \n" ); document.write( "
Algebra.Com's Answer #304857 by MathLover1(20850)\"\" \"About 
You can put this solution on YOUR website!
\r
\n" ); document.write( "\n" ); document.write( "\"12x+%2B+7y+=+19\" and \r
\n" ); document.write( "\n" ); document.write( "\"4x+-+y+=+3\"...solve the system
\n" ); document.write( "---------------------------------\r
\n" ); document.write( "\n" ); document.write( "\"4x+-+y+=+3\"......solve for \"y\"\r
\n" ); document.write( "\n" ); document.write( "\"4x+-+3+=+y\"......substitute in \"12x+%2B+7y+=+19\" and solve for \"x\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"12x+%2B+7%284x+-+3%29=+19\"\r
\n" ); document.write( "\n" ); document.write( "\"12x+%2B+28x+-+21=+19\"\r
\n" ); document.write( "\n" ); document.write( "\"40x+=+19%2B21\"\r
\n" ); document.write( "\n" ); document.write( "\"40x+=+40\"\r
\n" ); document.write( "\n" ); document.write( "\"x+=1\"....now find \"y\"\r
\n" ); document.write( "\n" ); document.write( "\"y=4x+-+3+\"\r
\n" ); document.write( "\n" ); document.write( "\"y=4%2A1+-+3+\"\r
\n" ); document.write( "\n" ); document.write( "\"y=1+\"\r
\n" ); document.write( "\n" ); document.write( " then the value of \"8x+%2B+8y=8%2A1%2B8%2A1=8%2B8=16\"\r
\n" ); document.write( "\n" ); document.write( "
\n" ); document.write( "
\n" );