document.write( "Question 768617: Solve the system by the addition method.
\n" ); document.write( "x+y=-1
\n" ); document.write( "x-y=17 \n" ); document.write( "

Algebra.Com's Answer #468407 by MathLover1(20850) $\"\"$ $\"About$

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$\"x%2By=-1\"$
\n" ); document.write( " $\"x-y=17\"$
\n" ); document.write( "________________add both\r
\n" ); document.write( "\n" ); document.write( " $\"x%2By%2Bx-y=-1%2B17\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"2x%2Bcross%28y%29-cross%28y%29=16\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"2x=16\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x=16%2F2\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x=8\"$ \r
\n" ); document.write( "\n" ); document.write( "now find $\"y\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x%2By=-1\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"8%2By=-1\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"y=-1-8\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"y=-9\"$ \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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