document.write( "Question 1022820: Use elimination to solve the system of equations\r
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document.write( "4.25x - 1.28y = -9.2
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document.write( "x + 1.28y = 17.6 \n" );
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Algebra.Com's Answer #638420 by addingup(3677)![]() ![]() You can put this solution on YOUR website! 4.25x - 1.28y = -9.2 \n" ); document.write( " x + 1.28y = 17.6 multiply both sides of this equation times -4.25 and add to the one above: \n" ); document.write( "4.25x - 1.28y = -9.2 \n" ); document.write( "+ \n" ); document.write( "-4.25x - 5.44y = -74.8 \n" ); document.write( "-------------------- - \n" ); document.write( ". . . -6.72y = -84 divide both sides by 6.72 (remember: -/- = +) \n" ); document.write( "y = 12.5 Now find x: \n" ); document.write( "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ \n" ); document.write( "x+1.28(12.5) = 17.6 \n" ); document.write( "x+16 = 17.6 \n" ); document.write( "x = 1.6 \n" ); document.write( "There you have it. Check the answers by substituting in the equations, I'll do one you do the other: \n" ); document.write( "4.25x-1.28y = -9.2 \n" ); document.write( "4.25(1.6)-1.28(12.5) = -9.2 \n" ); document.write( "6.8-16 = -9.2 Subtract on left to see that this is correct. You do the other equation. \n" ); document.write( " \n" ); document.write( " |