document.write( "Question 451650: the difference between the tens digit and the unit digit of a two digit number is 3. Suppose the tens digit is one less than twice the units digit. what is the number? \n" ); document.write( "
Algebra.Com's Answer #310557 by nerdybill(7384)\"\" \"About 
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the difference between the tens digit and the unit digit of a two digit number is 3. Suppose the tens digit is one less than twice the units digit. what is the number?
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\n" ); document.write( "Let x = tens digit
\n" ); document.write( "and y = units digit
\n" ); document.write( "then
\n" ); document.write( "from: \"the difference between the tens digit and the unit digit of a two digit number is 3\"
\n" ); document.write( "x-y = 3 (equation 1)
\n" ); document.write( "from: \"Suppose the tens digit is one less than twice the units digit\"
\n" ); document.write( "x = 2y-1 (equation 2)
\n" ); document.write( ".
\n" ); document.write( "Start with equation 1:
\n" ); document.write( "x-y = 3
\n" ); document.write( "substitute definition of x from equation 2:
\n" ); document.write( "2y-1-y = 3
\n" ); document.write( "y-1 = 3
\n" ); document.write( "y = 4
\n" ); document.write( ".
\n" ); document.write( "Substitute above into equation 1 to find x:
\n" ); document.write( "x-y = 3
\n" ); document.write( "x-4 = 3
\n" ); document.write( "x = 7
\n" ); document.write( ".
\n" ); document.write( "Solution: the number is 74
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