document.write( "Question 5256: how do you use elimination to solve for the x and the y
\n" ); document.write( "11x - 5y = 80
\n" ); document.write( "9x - 15y = 120 \n" ); document.write( "

Algebra.Com's Answer #2666 by xcentaur(357) $\"\"$ $\"About$

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9x - 15y = 120
\n" ); document.write( "3x - 5y = 40
\n" ); document.write( "y=(40-3x)/-5
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\n" ); document.write( "Substituting this value of y in eqn1,we have eliminated variable y from the first equation
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\n" ); document.write( "11x - 5y = 80
\n" ); document.write( "11x - 5(40-3x)/-5 = 80
\n" ); document.write( "multiplying through out by '-5'
\n" ); document.write( "-55x - 5(40-3x) = -400
\n" ); document.write( "dividing throughout by '-5'
\n" ); document.write( "11x +(40-3x) = 80
\n" ); document.write( "11x-3x=80-40
\n" ); document.write( "8x=40
\n" ); document.write( "x=5
\n" ); document.write( "

\n" ); document.write( "y=(40-3x)/-5
\n" ); document.write( "=(40-15)/-5
\n" ); document.write( "=25/-5
\n" ); document.write( "=-5
\n" ); document.write( "

\n" ); document.write( "x=5,y=-5
\n" ); document.write( "
Hope this helps,good luck. \n" ); document.write( "

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