document.write( "Question 300355: 0.3x-0.2y=4 and 0.5x+0.5y = -15/19 \n" ); document.write( "

Algebra.Com's Answer #215553 by Fombitz(32388) $\"\"$ $\"About$

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1. $\"0.3x-0.2y=4+\"$
\n" ); document.write( "2. $\"0.5x%2B0.5y+=+-15%2F19\"$
\n" ); document.write( "Multiply both equations by 10 to get rid of decimals.
\n" ); document.write( "Divide eq. 2 by 5, both sides.
\n" ); document.write( "1. $\"3x-2y=40+\"$
\n" ); document.write( "2. $\"x%2By+=+-30%2F19\"$
\n" ); document.write( "From eq. 1,
\n" ); document.write( " $\"3x-2y=40\"$
\n" ); document.write( " $\"2y=3x-40\"$
\n" ); document.write( " $\"y=%283%2F2%29x-20\"$
\n" ); document.write( "Substitute into eq. 2,
\n" ); document.write( " $\"x%2B%283%2F2%29x-20=-30%2F19\"$
\n" ); document.write( " $\"%285%2F2%29x=-30%2F19%2B380%2F19\"$
\n" ); document.write( " $\"%285%2F2%29x=350%2F19\"$
\n" ); document.write( " $\"highlight_green%28+x=140%2F19%29\"$
\n" ); document.write( "Then from eq. 2,
\n" ); document.write( " $\"x%2By=-30%2F19\"$
\n" ); document.write( " $\"140%2F19%2By=-30%2F19\"$
\n" ); document.write( " $\"highlight_green%28+y=-170%2F19%29\"$
\n" ); document.write( " \n" ); document.write( "

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