document.write( "Question 371084: -3x-y=155 6x+7y=5 solve using substitution method \n" ); document.write( "

Algebra.Com's Answer #264378 by Fombitz(32388) $\"\"$ $\"About$

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1. $\"-3x-y=155\"$
\n" ); document.write( "2. $\"+6x%2B7y=5\"$
\n" ); document.write( "From eq. 1,
\n" ); document.write( " $\"-3x=y%2B155\"$
\n" ); document.write( " $\"6x=-2y-310\"$
\n" ); document.write( "Substitute into eq. 2,
\n" ); document.write( " $\"-2y-310%2B7y=5\"$
\n" ); document.write( " $\"5y=315\"$
\n" ); document.write( " $\"highlight%28y=63%29\"$
\n" ); document.write( "Then from eq. 1,
\n" ); document.write( " $\"-3x-63=155\"$
\n" ); document.write( " $\"-3x=218\"$
\n" ); document.write( " $\"highlight%28x=-218%2F3%29\"$
\n" ); document.write( " \n" ); document.write( "

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