document.write( "Question 167909: Find the number of two-digit positive integers whose digits total 7. I know the answer is 7 (16, 25, 34, 43, 52, 61, 70) but my teacher wants me to show it in an algebraic formula. How do I do that? This question is not from a textbook. \n" ); document.write( "
Algebra.Com's Answer #123753 by checkley77(12844)\"\" \"About 
You can put this solution on YOUR website!
X+Y=7
\n" ); document.write( "MAKE UP A TABLE WITH X=0,1,2,3,4,5,6 & 7 AND SOLVE FOR Y.
\n" ); document.write( "0+Y=7
\n" ); document.write( "Y=7 OR 07
\n" ); document.write( "1+Y=7
\n" ); document.write( "Y=7-1
\n" ); document.write( "Y=6 OR 16
\n" ); document.write( "2=Y=7
\n" ); document.write( "Y=7-2
\n" ); document.write( "Y=5 OR 25
\n" ); document.write( "3=Y=7
\n" ); document.write( "Y=7-3
\n" ); document.write( "Y=4 OR 34
\n" ); document.write( "5+Y=7
\n" ); document.write( "Y=7-5
\n" ); document.write( "Y=2 OR 52
\n" ); document.write( "6+Y=7
\n" ); document.write( "Y=7-6
\n" ); document.write( "Y=1 OR 61
\n" ); document.write( "7+Y=7
\n" ); document.write( "Y=7-7
\n" ); document.write( "Y=0 OR 70\r
\n" ); document.write( "
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