document.write( "Question 299043: solve each linear system by subtracting the equations....
\n" ); document.write( "1) -x-y=8 2x-y=-1
\n" ); document.write( "2) x+y=-7 3x+y=-9
\n" ); document.write( "3) x+3y=19 x-y=-1
\n" ); document.write( "4) 3x-3y=-15 3x+3y=3\r
\n" ); document.write( "\n" ); document.write( "AND MORE TO ASK THANKYOU
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Algebra.Com's Answer #215049 by checkley77(12844)\"\" \"About 
You can put this solution on YOUR website!
1) -x-y=8
\n" ); document.write( "-(2x-y=-1)
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\n" ); document.write( "-3x=9
\n" ); document.write( "x=9/-3
\n" ); document.write( "x=-3 ans.
\n" ); document.write( "-(-3)-y=8
\n" ); document.write( "3-y=8
\n" ); document.write( "-y=8-3
\n" ); document.write( "y=-5 ans.
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\n" ); document.write( "2) x+y=-7
\n" ); document.write( "-(3x+y=-9)
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\n" ); document.write( "-2x=2
\n" ); document.write( "x=2/-2
\n" ); document.write( "x=-1 ans.
\n" ); document.write( "-1+y=-7
\n" ); document.write( "y=-7+1
\n" ); document.write( "y=-6 ans.
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\n" ); document.write( "I'll leave the remaing 2 for you to practice with.
\n" ); document.write( "3) x+3y=19 x-y=-1 [ans. x=4 & y=5]
\n" ); document.write( "4) 3x-3y=-15 3x+3y=3 [ans. x=-2 & y=3]
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