document.write( "Question 950162: the sum of the digits of a certain two-digit number is 7 reversing the digits increases the number by 9. what is the number \n" ); document.write( "
Algebra.Com's Answer #580135 by lwsshak3(11628)\"\" \"About 
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the sum of the digits of a certain two-digit number is 7 reversing the digits increases the number by 9. what is the number
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\n" ); document.write( "let u=units digit
\n" ); document.write( "let t=tens digit
\n" ); document.write( "u+t=7
\n" ); document.write( "t=7-u
\n" ); document.write( "..
\n" ); document.write( "number=10t+u
\n" ); document.write( "reversing digits number=10u+t
\n" ); document.write( "..
\n" ); document.write( "10u+t-(10t+u)=9
\n" ); document.write( "10u+t-10t-u=9
\n" ); document.write( "10u+(7-u)-10(7-u)-u=9
\n" ); document.write( "10u+7-u-70+10u-u=9
\n" ); document.write( "18u=72
\n" ); document.write( "u=4
\n" ); document.write( "t=7-u=3
\n" ); document.write( "number: 10t +u=30+4=34 \n" ); document.write( "
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