document.write( "Question 486593: This problem evolves using substitution.
\n" ); document.write( "0.1x + 0.8y= -2.1
\n" ); document.write( "0.9x - 0.9y= 5.4 Couldnt figure out how to start to get an answer. Thank you for your assistance. \n" ); document.write( "
Algebra.Com's Answer #332627 by mananth(16949)\"\" \"About 
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0.1x + 0.8y= -2.1
\n" ); document.write( "0.9x - 0.9y= 5.4 \r
\n" ); document.write( "\n" ); document.write( "multiply both equations by 10 to make life easy.
\n" ); document.write( "x+8y=-21
\n" ); document.write( "9x-9y=54 \r
\n" ); document.write( "\n" ); document.write( "1 x + 8 y = -21 .............1
\n" ); document.write( "-9 y = 54 -9 x ---------2
\n" ); document.write( "/ -9 =
\n" ); document.write( " y = -6 + 1 x
\n" ); document.write( "Substitute y in (1)
\n" ); document.write( "1 x + 8 ( -6 + 1 x ) = -21
\n" ); document.write( "1 x -48 + 8 x = -21
\n" ); document.write( "1 x + 8 x = -21 48
\n" ); document.write( "9 x = 27
\n" ); document.write( "/ 9
\n" ); document.write( "x= 3
\n" ); document.write( "Plug the value of x in (1)
\n" ); document.write( "1 x + 8 y = -21
\n" ); document.write( "1 * 3 + 8 y = -21
\n" ); document.write( "3 + 8 y = -21
\n" ); document.write( "8 y = -24
\n" ); document.write( "/ 8
\n" ); document.write( "y= -3
\n" ); document.write( "m.ananth@hotmail.ca
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