document.write( "Question 667169: what the follwing system of equation by substitution and check. x-y=13 9x-y=45 \n" ); document.write( "

Algebra.Com's Answer #414842 by mananth(16946) $\"\"$ $\"About$

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9 x + -1 y = 45 .............1
\n" ); document.write( "-1 y = 45 + -9 x
\n" ); document.write( "/ -1 =
\n" ); document.write( " y = -45 + 9 x
\n" ); document.write( "1 x + -1 y = 13 .....................2
\n" ); document.write( "Substitute y in (2)
\n" ); document.write( "x-1(-45+9x)=13
\n" ); document.write( "x+45-9x=13
\n" ); document.write( "x-9x=-32
\n" ); document.write( "-8x=-32
\n" ); document.write( "/ -8
\n" ); document.write( "x=4
\n" ); document.write( "Plug the value of x in (1)
\n" ); document.write( "9x-y = 45
\n" ); document.write( "9 * 4 + -1 y = 45
\n" ); document.write( "36 + -1 y = 45
\n" ); document.write( "-1 y = 9
\n" ); document.write( "/ -1
\n" ); document.write( "y= -9 \r
\n" ); document.write( "\n" ); document.write( "CHECK
\n" ); document.write( "x-y=13\r
\n" ); document.write( "\n" ); document.write( "4-(-9)=13
\n" ); document.write( "
\n" ); document.write( "m.ananth@hotmail.ca
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