document.write( "Question 170370: simultaneous equations\r
\n" ); document.write( "\n" ); document.write( "x-5/3y=7
\n" ); document.write( "4/7x+y=-13/7 \n" ); document.write( "
Algebra.Com's Answer #125769 by checkley77(12844)\"\" \"About 
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x-5y/3=7
\n" ); document.write( "4x/7+y=-13/7 multiply this equation by 5/3 & add
\n" ); document.write( "(5/3)(4x/7)+5y/3=-(5/3)(13/7)
\n" ); document.write( "20x/21+5y/3=-65/21
\n" ); document.write( "x-5y/3=7
\n" ); document.write( "-------------------
\n" ); document.write( "20x/21+21x/21=7-65/21
\n" ); document.write( "41x/21=(7*21-65)/21
\n" ); document.write( "41x/21=(147-65)/21
\n" ); document.write( "41x/21=82/21
\n" ); document.write( "41x=82
\n" ); document.write( "x=82/41
\n" ); document.write( "x=2 ans.
\n" ); document.write( "2-5y/3=7
\n" ); document.write( "-5y/3=7-2
\n" ); document.write( "-5y/3=5
\n" ); document.write( "-5y=5*3
\n" ); document.write( "-5y=15
\n" ); document.write( "y=15/-5
\n" ); document.write( "y=-3 ans.
\n" ); document.write( "Proof:
\n" ); document.write( "4*2/7-3=-13/7
\n" ); document.write( "8/7-21/7=-13/7
\n" ); document.write( "-13/7=-13/7\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
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