document.write( "Question 863966: solution of subtitution
\n" ); document.write( " y=2x+7 y=x-1 \n" ); document.write( "
Algebra.Com's Answer #520712 by mananth(16946)\"\" \"About 
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-1 x + 1 y = -1 .............1
\n" ); document.write( "1 y = -1 + 1 x
\n" ); document.write( "/ 1 =
\n" ); document.write( " y = -1 + 1 x
\n" ); document.write( "-2 x + 1 y = 7 .....................2
\n" ); document.write( "Substitute y in (2)
\n" ); document.write( "-2 x + 1 ( -1 + 1 x ) = 7
\n" ); document.write( "-2 x + -1 + 1 x = 7
\n" ); document.write( "-2 x 1 x = 8
\n" ); document.write( "-1 x = 8
\n" ); document.write( "/ -1
\n" ); document.write( "x= -8
\n" ); document.write( "Plug the value of x in (1)
\n" ); document.write( "-1 x + 1 y = -1
\n" ); document.write( "-1 * -8 + 1 y = -1
\n" ); document.write( "8 + 1 y = -1
\n" ); document.write( "1 y = -9
\n" ); document.write( "/ 1
\n" ); document.write( "y= -9
\n" ); document.write( "m.ananth@hotmail.ca
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