document.write( "Question 328871: Solve each system by substitution\r
\n" ); document.write( "\n" ); document.write( "{y=x-1}
\n" ); document.write( "{x+y= -7} \n" ); document.write( "

Algebra.Com's Answer #235619 by Fombitz(32388) $\"\"$ $\"About$

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1. $\"y=x-1\"$
\n" ); document.write( "2. $\"x%2By=+-7\"$
\n" ); document.write( "Substitue eq. 1 directly into eq. 2,
\n" ); document.write( " $\"x%2Bx-1=-7\"$
\n" ); document.write( " $\"2x=-6\"$
\n" ); document.write( " $\"x=-3\"$
\n" ); document.write( "Then from eq. 1,
\n" ); document.write( " $\"y=-3-1\"$
\n" ); document.write( " $\"y=-4\"$
\n" ); document.write( " \n" ); document.write( "

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