document.write( "Question 25804: Please help me with this problem:
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document.write( "Find the two-digit number whose tens digit is 3 less than the units digit. The original number is 6 more than 4 times the sum of the digits.
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document.write( "I could REALLY use your HELP! \n" );
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Algebra.Com's Answer #13889 by atif.muhammad(135)![]() ![]() ![]() You can put this solution on YOUR website! Each two digit number has two numbers (duh!).\r \n" ); document.write( "\n" ); document.write( "Let's allow the tens digit to be x and the units digit to be y.\r \n" ); document.write( "\n" ); document.write( "Tens digit is 3 less than the units digit: x = y-3\r \n" ); document.write( "\n" ); document.write( "Original number is 6 more than 4 times the sum of the digits: 10x+y-6 = 4x + 4y\r \n" ); document.write( "\n" ); document.write( "This gives us simulataneous equations! \n" ); document.write( "First let's clear the mess:\r \n" ); document.write( "\n" ); document.write( "1. x= y-3 \n" ); document.write( "2. 6x-3y=6\r \n" ); document.write( "\n" ); document.write( "Substitute 1 into 2:\r \n" ); document.write( "\n" ); document.write( "6(y-3) -3y =6 \n" ); document.write( "6y - 18 - 3y = 6 \n" ); document.write( "3y = 24 \n" ); document.write( "y = 8\r \n" ); document.write( "\n" ); document.write( "Our units digit is 8\r \n" ); document.write( "\n" ); document.write( "Substitute y= 8 into 1.\r \n" ); document.write( "\n" ); document.write( "x = y - 3 \n" ); document.write( "x = 5\r \n" ); document.write( "\n" ); document.write( "Our tens digit is 5\r \n" ); document.write( "\n" ); document.write( "Therefore, our number is 58.\r \n" ); document.write( "\n" ); document.write( "Let's test this.\r \n" ); document.write( "\n" ); document.write( "Tens digit is 3 less than units digit: 58 --> 5 is 3 less than 8! \n" ); document.write( "Original number is 6 more than 4 times the sum of the digits --> sum of the digits = 13, 4 times the sum of the digits = 52, Add 6, 58!\r \n" ); document.write( "\n" ); document.write( "We have proven that our number is 58! \n" ); document.write( " |