document.write( "Question 250837: use elimination to solve each system of equations.
\n" ); document.write( "2.4x+y=-9
\n" ); document.write( " 4x+2y=-10 \n" ); document.write( "

Algebra.Com's Answer #184440 by drk(1908) $\"\"$ $\"About$

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Here are the original equations:
\n" ); document.write( "(i) $\"4x+%2B++y+=+-+9\"$
\n" ); document.write( "(ii) $\"4x+%2B+2y+=+-+10\"$
\n" ); document.write( "To eliminate means some kind of multiplication and then add down to get rid of a variable. So, let's multiply the first equation by -1.
\n" ); document.write( "(iii) $\"-4x+-++y+=+9\"$
\n" ); document.write( "(iv) $\"4x++%2B+2y+=+-10\"$
\n" ); document.write( "adding down gives us
\n" ); document.write( "(v) $\"y+=+-1\"$
\n" ); document.write( "substitute this back into (i) to get x.
\n" ); document.write( " $\"x+=+-2\"$ . \n" ); document.write( "

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