document.write( "Question 177056: how do i solve x=-11y; 15y-21=-2x using substitution? \n" ); document.write( "

Algebra.Com's Answer #132099 by Fombitz(32388) $\"\"$ $\"About$

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1. $\"x=-11y\"$
\n" ); document.write( "2. $\"15y-21=-2x\"$
\n" ); document.write( "Directly substitute eq. 1 into eq. 2 and solve for y.
\n" ); document.write( "2. $\"15y-21=-2x\"$
\n" ); document.write( " $\"15y-21=-2%28-11y%29\"$
\n" ); document.write( " $\"15y-21=22y\"$
\n" ); document.write( " $\"-7y-21=0\"$
\n" ); document.write( " $\"-7y=21\"$
\n" ); document.write( " $\"highlight%28y=-3%29\"$
\n" ); document.write( "Then from eq. 1,
\n" ); document.write( "1. $\"x=-11y\"$
\n" ); document.write( " $\"x=-11%28-3%29\"$
\n" ); document.write( " $\"highlight%28x=33%29\"$ \n" ); document.write( "

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