document.write( "Question 276756: x-3y=0 3x+y=7 \n" ); document.write( "

Algebra.Com's Answer #201677 by checkley77(12844) $\"\"$ $\"About$

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x-3y=0
\n" ); document.write( "x=3y
\n" ); document.write( "Replace x in the next equation with (3y)
\n" ); document.write( "3x+y=7
\n" ); document.write( "3(3y)+y=7
\n" ); document.write( "9y+y=7
\n" ); document.write( "10y=7
\n" ); document.write( "y=7/10
\n" ); document.write( "y=.7 ans.
\n" ); document.write( "x=3*.7
\n" ); document.write( "x=2.1 ans.
\n" ); document.write( "Proof:
\n" ); document.write( "3*2.1+.7=7
\n" ); document.write( "6.3+.7=7
\n" ); document.write( "7=7 \n" ); document.write( "

\n" );