document.write( "Question 937699: amy is 3 years older than kevin. the sum of their ages is 39. how old is kevin?
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Algebra.Com's Answer #571107 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"+a+\"$ = Amy's age now
\n" ); document.write( "Let $\"+k+\"$ = Kevin's age now
\n" ); document.write( "(1) $\"+a+=+k+%2B+3+\"$
\n" ); document.write( "(2) $\"+a+%2B+k+=+39+\"$
\n" ); document.write( "------------------
\n" ); document.write( "Substitute (1) into (2)
\n" ); document.write( "(2) $\"+k+%2B+3+%2B+k+=+39+\"$
\n" ); document.write( "(2) $\"+2k+%2B+3+=+39+\"$
\n" ); document.write( "(2) $\"+2k+=+36+\"$
\n" ); document.write( "(2) $\"+k+=+18+\"$
\n" ); document.write( "Kevin is 18
\n" ); document.write( "check:
\n" ); document.write( "(1) $\"+a+=+18+%2B+3+\"$
\n" ); document.write( "(1) $\"+a+=+21+\"$
\n" ); document.write( "and
\n" ); document.write( "(2) $\"+a+%2B+18+=+39+\"$
\n" ); document.write( "(2) $\"+a+=+21+\"$
\n" ); document.write( "OK\r
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