document.write( "Question 345538: Solve by the substitution method.
\n" ); document.write( "5x+4y=7
\n" ); document.write( "-3x+y=7 \n" ); document.write( "

Algebra.Com's Answer #247126 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
1. $\"5x%2B4y=7\"$
\n" ); document.write( "2. $\"-3x%2By=7\"$
\n" ); document.write( "From eq. 2,
\n" ); document.write( " $\"y=3x%2B7\"$
\n" ); document.write( "Substitute into eq. 1,
\n" ); document.write( " $\"5x%2B4%283x%2B7%29=7\"$
\n" ); document.write( " $\"5x%2B12x%2B28=7\"$
\n" ); document.write( " $\"17x=-21\"$
\n" ); document.write( " $\"highlight%28x=-21%2F17%29\"$
\n" ); document.write( ".
\n" ); document.write( ".
\n" ); document.write( ".
\n" ); document.write( " $\"y=3%28-21%2F17%29%2B7\"$
\n" ); document.write( " $\"y=-63%2F17%2B119%2F17\"$
\n" ); document.write( " $\"highlight%28y=56%2F17%29\"$
\n" ); document.write( " \n" ); document.write( "

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