document.write( "Question 949207: SOLVE BY SUBSTITUTION \r
\n" ); document.write( "\n" ); document.write( "X+y=0
\n" ); document.write( " X-2y+9=0\r
\n" ); document.write( "\n" ); document.write( " I did... X+y=0 and I subtracted x from both side and got Y=0
\n" ); document.write( "Then I substituted the (0) into the second equation x-2(0)+9=0 >>x-2+9=0 which I then combined like terms and got x+7=0 and I subtracted 7 from both sides and got X=-7\r
\n" ); document.write( "\n" ); document.write( "Please help I am stuck. And please show how to check my answers
\n" ); document.write( "Thank you \n" ); document.write( "
Algebra.Com's Answer #579430 by rothauserc(4718)\"\" \"About 
You can put this solution on YOUR website!
We are given
\n" ); document.write( "X +y = 0
\n" ); document.write( "X -2y +9 = 0
\n" ); document.write( "from the first equation, we have x = -y by subtraction y from both sides of =
\n" ); document.write( "substitute for x in second equation and we get
\n" ); document.write( "-y -2y +9 = 0
\n" ); document.write( "-3y = -9
\n" ); document.write( "subtract 9 from both sides of =
\n" ); document.write( "y = 3 and from first equation x = -3
\n" ); document.write( "now substitute for x and y in the second equation
\n" ); document.write( "-3 -(2*3) +9 = 0
\n" ); document.write( "-3 -6 +9 = 0
\n" ); document.write( "-9 +9 = 0
\n" ); document.write( "0 = 0
\n" ); document.write( "our answers for x = -3 and y = 3, check
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