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 $ 42.00 , and on tuesday the store sold 20 maps and 15 books for a total of $ 70.00 . at this store , how much less does a map sell for than a book ?
"12 x + 10 y = 42 20 x + 15 y = 70 multiply eq 1 by 5 and eq 2 by 3 60 x + 50 y = 42 * 5 60 x + 45 y = 70 * 3 subtracting 1 from 2 5 y = 210 - 210 y = 0 therefore x = 3.5 difference in price = 3.5 c"
divide(subtract(70.00, negate(multiply(15, divide(subtract(multiply(42.00, const_4), multiply(70.00, const_2)), subtract(multiply(10, const_4), multiply(15, const_2)))))), 20)