document.write( "Question 914290: a is directly proportional to b if a=15 then b=9 \n" ); document.write( "
Algebra.Com's Answer #555040 by ewatrrr(24785)\"\" \"About 
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a = kb
\n" ); document.write( "15 = k9
\n" ); document.write( "15/9 = 5/3 = k, the constant of the direct proportion
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