document.write( "Question 884445: solve using substitution 0.1x+0.8y=23
\n" ); document.write( " 0.7x-0.5y=83 \n" ); document.write( "

Algebra.Com's Answer #534323 by Fombitz(32388) $\"\"$ $\"About$

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Multiply both equations by 10.
\n" ); document.write( " $\"x%2B8y=23\"$
\n" ); document.write( " $\"7x-5y=83\"$
\n" ); document.write( "From eq. 1,
\n" ); document.write( " $\"x=23-8y\"$
\n" ); document.write( "Substitute into eq. 2,
\n" ); document.write( " $\"7%2823-8y%29-5y=83\"$
\n" ); document.write( " $\"161-56y-5y=83\"$
\n" ); document.write( " $\"-61y=-78\"$
\n" ); document.write( " $\"y=78%2F61\"$
\n" ); document.write( "Then,
\n" ); document.write( " $\"x=23%2B8%2878%2F61%29\"$
\n" ); document.write( " $\"x=1403%2F61-624%2F61\"$
\n" ); document.write( " $\"x=779%2F61\"$ \n" ); document.write( "

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