document.write( "Question 168664: The sum of the digits of two digits number is 9. If the units digit is 5 more than the ten's digit, What is the number? \n" ); document.write( "
Algebra.Com's Answer #124301 by nerdybill(7384)\"\" \"About 
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The sum of the digits of two digits number is 9. If the units digit is 5 more than the ten's digit, What is the number?
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\n" ); document.write( "Let x = ten's digit
\n" ); document.write( "and y = unit's digit
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\n" ); document.write( "From: \"The sum of the digits of two digits number is 9.\" we get:
\n" ); document.write( "x + y = 9 (equation 1)
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\n" ); document.write( "From: \"the units digit is 5 more than the ten's digit\" we get:
\n" ); document.write( "y = x+5 (equation 2)
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\n" ); document.write( "Using the definition of 'y' from equation 2, substitute it into equation 1 and solve for 'x':
\n" ); document.write( "x + y = 9
\n" ); document.write( "x + x+5 = 9
\n" ); document.write( "2x + 5 = 9
\n" ); document.write( "2x = 4
\n" ); document.write( "x = 2 (ten's digit)
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\n" ); document.write( "unit's digit:
\n" ); document.write( "y = x+5
\n" ); document.write( "y = 2+5
\n" ); document.write( "y = 7 (unit's digit)
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\n" ); document.write( "The number is 27 \n" ); document.write( "
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