document.write( "Question 315035: solve by the substitution method.
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document.write( "x+y=6
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document.write( "-4x+y=-4
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document.write( "what is the solution of the system? \n" );
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Algebra.Com's Answer #225348 by Jstrasner(112)![]() ![]() You can put this solution on YOUR website! Hey,\r \n" ); document.write( "\n" ); document.write( "So for this one, we need to substitute x in one of the equations\r \n" ); document.write( "\n" ); document.write( "In the first one:\r \n" ); document.write( "\n" ); document.write( "x+y=6 which can also be:\r \n" ); document.write( "\n" ); document.write( "x=6-y\r \n" ); document.write( "\n" ); document.write( "We can then substitute this for x in the other equation:\r \n" ); document.write( "\n" ); document.write( "-4(6-y) + y = -4\r \n" ); document.write( "\n" ); document.write( "-24 +4y +y =-4\r \n" ); document.write( "\n" ); document.write( "5y=20 \n" ); document.write( "y=4\r \n" ); document.write( "\n" ); document.write( "then we put this into the original equation:\r \n" ); document.write( "\n" ); document.write( "x + 4=6\r \n" ); document.write( "\n" ); document.write( "x= 2\r \n" ); document.write( "\n" ); document.write( "I hope this helps! \n" ); document.write( " |