a certain store sells all maps at one price and all books at another price . on monday the store sold 12 maps and 10 books for a total of $ 38.00 , and on tuesday the store sold 12 maps and 9 books for a total of $ 30.00 . at this store , how much less does a map sell for than a book ?
"12 x + 10 y = 38 12 x + 9 y = 30 subtracting 1 from 2 y = 8 therefore x = 3.5 difference in price = 4.5 e"
divide(subtract(30.00, negate(multiply(9, divide(subtract(multiply(38.00, const_4), multiply(30.00, const_2)), subtract(multiply(10, const_4), multiply(9, const_2)))))), 12)