document.write( "Question 756568: The cost C of printing a book is directly proportional to the number of pages p of the book. If an 36 page book costs $27 to print, how much will a 45 page book cost to print? \n" ); document.write( "
Algebra.Com's Answer #460360 by nerdybill(7384)\"\" \"About 
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The cost C of printing a book is directly proportional to the number of pages p of the book. If an 36 page book costs $27 to print, how much will a 45 page book cost to print?
\n" ); document.write( "\"direct proportional\" think:
\n" ); document.write( "y = kx
\n" ); document.write( "solving for k:
\n" ); document.write( "y/x = k
\n" ); document.write( ".
\n" ); document.write( "So, given two sets of data the equation would be:
\n" ); document.write( "y1/x1 = y2/x2
\n" ); document.write( "cost1/page1 = cost2/page2
\n" ); document.write( "27/36 = cost2/45
\n" ); document.write( "27/36*45 = cost2
\n" ); document.write( "27/4*5 = cost2
\n" ); document.write( "6.75 * 5 = cost2
\n" ); document.write( "$33.75 = cost2\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
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