document.write( "Question 423206: solving linear systems using substitution, what is
\n" ); document.write( "4x-7y=10
\n" ); document.write( "y=x-7
\n" ); document.write( " \n" ); document.write( "

Algebra.Com's Answer #295252 by mananth(16946) $\"\"$ $\"About$

You can put this solution on YOUR website!
4x-7y=10 .............1
\n" ); document.write( "x-y=7.............2
\n" ); document.write( "
\n" ); document.write( "multiply (1)by -1
\n" ); document.write( "Multiply (2) by 7
\n" ); document.write( "-4x+7y=-10
\n" ); document.write( "7x-7y=49
\n" ); document.write( "
\n" ); document.write( "Add the two equations
\n" ); document.write( "
\n" ); document.write( "3x=39
\n" ); document.write( "
\n" ); document.write( "/3
\n" ); document.write( "
\n" ); document.write( "x=13
\n" ); document.write( "
\n" ); document.write( "plug value of x in (1)
\n" ); document.write( "
\n" ); document.write( "4x-7y=10
\n" ); document.write( "52-7y=10
\n" ); document.write( "-7y=10-52
\n" ); document.write( "-7y=-42
\n" ); document.write( "y=6 \n" ); document.write( "

\n" );