document.write( "Question 345586: Solve by using the substitution method
\n" ); document.write( "x+y=56
\n" ); document.write( "x+3y=56 \n" ); document.write( "

Algebra.Com's Answer #247165 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
1. $\"x%2By=56\"$
\n" ); document.write( "2. $\"x%2B3y=56\"$
\n" ); document.write( "From eq. 1,
\n" ); document.write( " $\"y=56-x\"$
\n" ); document.write( " $\"3y=168-3x\"$
\n" ); document.write( "Substitute into eq. 2,
\n" ); document.write( " $\"x%2B168-3x=56\"$
\n" ); document.write( " $\"-2x=-112\"$
\n" ); document.write( " $\"highlight%28x=56%29\"$
\n" ); document.write( "Then from eq. 1,
\n" ); document.write( " $\"56%2By=56\"$
\n" ); document.write( " $\"highlight%28y=0%29\"$
\n" ); document.write( " \n" ); document.write( "

\n" );