document.write( "Question 369668: Can someone please show me the steps to solving the system x+y=20 and x-y=28, using the substitution method? Thank you! \n" ); document.write( "

Algebra.Com's Answer #263425 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
1. $\"x%2By=20\"$
\n" ); document.write( "2. $\"x-y=28\"$
\n" ); document.write( "From eq. 1,
\n" ); document.write( " $\"x=20-y\"$
\n" ); document.write( "Substitute into eq. 2,
\n" ); document.write( " $\"%2820-y%29-y=28\"$
\n" ); document.write( " $\"20-2y=28\"$
\n" ); document.write( " $\"-2y=8\"$
\n" ); document.write( " $\"highlight%28y=-4%29\"$
\n" ); document.write( "Then from eq. 1,
\n" ); document.write( " $\"x-4=20\"$
\n" ); document.write( " $\"highlight%28x=24%29\"$ \n" ); document.write( "

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