document.write( "Question 724494: 2x-y=8 5x-2y=21 please solve using substitution method to solve the system of linear equations \n" ); document.write( "

Algebra.Com's Answer #443776 by mananth(16946) $\"\"$ $\"About$

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2 x + -1 y = 8 .............1
\n" ); document.write( "-1 y = 8 + -2 x
\n" ); document.write( "/ -1 =
\n" ); document.write( " y = -8 + 2 x
\n" ); document.write( "5 x + -2 y = 21 .....................2
\n" ); document.write( "Substitute y in (2)
\n" ); document.write( "5 x + -2 ( -8 + 2 x ) = 21
\n" ); document.write( "5 x + 16 + -4 x = 21
\n" ); document.write( "5 x -4 x = 5
\n" ); document.write( "1 x = 5
\n" ); document.write( "/ 1
\n" ); document.write( "x= 5
\n" ); document.write( "Plug the value of x in (1)
\n" ); document.write( "2 x + -1 y = 8
\n" ); document.write( "2 * 5 + -1 y = 8
\n" ); document.write( "10 + -1 y = 8
\n" ); document.write( "-1 y = -2
\n" ); document.write( "/ -1
\n" ); document.write( "y= 2
\n" ); document.write( "m.ananth@hotmail.ca
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