document.write( "Question 180718: The book cost of Hiro’s biology book was $13.00 more than the cost of his history book. The cost of his English was $27.00 less than the cost of his history book.
\n" ); document.write( "how do I know what is the cost of each book if I don't have at least one price for one?
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Algebra.Com's Answer #135435 by user_dude2008(1862)\"\" \"About 
You can put this solution on YOUR website!
Equation #1: \r
\n" ); document.write( "\n" ); document.write( "\"The book cost of Hiro’s biology book was $13.00 more than the cost of his history book\" ----> \"b=h%2B13\"\r
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\n" ); document.write( "\n" ); document.write( "Equation #2:\r
\n" ); document.write( "\n" ); document.write( "\"The cost of his English was $27.00 less than the cost of his history book\" ---> \"e=h-27\"\r
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\n" ); document.write( "\n" ); document.write( "You have 3 variables but only 2 equations. So you'll get infinite number of solutions. You need 3 equations.
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