document.write( "Question 322997: Solve using elimination
\n" ); document.write( "7x + 3y = -4
\n" ); document.write( "6x + 7y = 32 \n" ); document.write( "

Algebra.Com's Answer #231207 by stanbon(75887) $\"\"$ $\"About$

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Solve using elimination
\n" ); document.write( "7x + 3y = -4
\n" ); document.write( "6x + 7y = 32
\n" ); document.write( "====================
\n" ); document.write( "multiply thru 1st by 7
\n" ); document.write( "multiply thru 2nd by 3
\n" ); document.write( "-------
\n" ); document.write( "49x + 21y = -12
\n" ); document.write( "18x + 21y = 96
\n" ); document.write( "--------
\n" ); document.write( "Subtract 2nd from 1st and solve for \"x\":
\n" ); document.write( "31x = -108
\n" ); document.write( "x = -108/31
\n" ); document.write( "--------------------
\n" ); document.write( "Substitute into 6x + 7y = 32 to solve for \"y\":
\n" ); document.write( "6(108/31) + 7y = 32
\n" ); document.write( "7y = 32 - 6(-108/31)
\n" ); document.write( "7y = 52.9032
\n" ); document.write( "y = 1640/217
\n" ); document.write( "=======================
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "

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