document.write( "Question 981067: The variable Z is directly proportional to X, and inversely proportional to Y. When X is 6 and Y is 6, Z has the value 12.
\n" ); document.write( "What is the value of Z when X = 13, and Y = 10
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Algebra.Com's Answer #602083 by rothauserc(4718)\"\" \"About 
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Z = k * X / Y where k is the constant of proportionality
\n" ); document.write( "when Z = 12, X = 6, Y = 6 we have
\n" ); document.write( "12 = k * 6 / 6
\n" ); document.write( "k = 12
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\n" ); document.write( "Z = 12 * 13 / 10
\n" ); document.write( "Z = 156 / 10
\n" ); document.write( "Z = 15.6
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