document.write( "Question 400011: Could someone please explain how to do these problems, we are solving problems with two variables and I do not understand how to even start working on them, the directions state...Solve by the addition-or-subtraction method, if someone could explain how they are solved I think I could get it....\r
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document.write( "3x-y=-5
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document.write( "2x+2y=-6\r
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document.write( "I would greatly appreciate it...thanks!!!! \n" );
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Algebra.Com's Answer #283229 by stanbon(75887)![]() ![]() ![]() You can put this solution on YOUR website! 3x-y=-5 \n" ); document.write( "2x+2y=-6 \r \n" ); document.write( "\n" ); document.write( "----- \n" ); document.write( "It's arbitrary whether you eliminate the x-terms \n" ); document.write( "or the y-terms. \n" ); document.write( "--- \n" ); document.write( "If you want to eliminate the x terms: \n" ); document.write( "multiply thru the 1st equation by 2 \n" ); document.write( "multiply thru the 2nd equation by 3 \n" ); document.write( "---- \n" ); document.write( "If you want to eliminate the y-terms; \n" ); document.write( "multiply thru the 1st equation by 2 \n" ); document.write( "leave the 2nd equation alone. \n" ); document.write( "========================== \n" ); document.write( "Looks like eliminating the y-terms would be easier so do it: \n" ); document.write( "6x-2y = 10 \n" ); document.write( "2x+2y=-6 \n" ); document.write( "---------------- \n" ); document.write( "Add and solve for \"x\": \n" ); document.write( "8x = 4 \n" ); document.write( "x = 1/2 \n" ); document.write( "--- \n" ); document.write( "Solve for \"y\": \n" ); document.write( "2x+2y = -6 \n" ); document.write( "x+y = -3 \n" ); document.write( "(1/2) + y = -3 \n" ); document.write( "y = -7/2 \n" ); document.write( "---------------- \n" ); document.write( "Hope that helps. \n" ); document.write( "Check out the web using Google to search for \n" ); document.write( "\"solving linear systems\" to see more on this \n" ); document.write( "subject. \n" ); document.write( "============== \n" ); document.write( "Cheers, \n" ); document.write( "Stan H. \n" ); document.write( " \n" ); document.write( " |