document.write( "Question 213996: Please help me solve the substituation x+y=12 and x-y=-4. I can't figure out how to solve these \n" ); document.write( "
Algebra.Com's Answer #161638 by Alan3354(69443)![]() ![]() You can put this solution on YOUR website! There's more than one method. The easiest method for this pair is elimination and substitution. \n" ); document.write( "x+y=12 \n" ); document.write( "x-y=-4 \n" ); document.write( "--------- Add the 2 equations \n" ); document.write( "2x = 8 \n" ); document.write( "x = 4 \n" ); document.write( "------ \n" ); document.write( "Sub for x into either eqn \n" ); document.write( "x+y = 12 \n" ); document.write( "4+y = 12 \n" ); document.write( "y = 8 \n" ); document.write( "----- \n" ); document.write( " |