Use method of elimination:
9x + 4y = -8
-4x - 8y = 16
Janice and Bob are selling donuts for a fundraiser. Customers can by glazed and sprinkled donuts. Janice sold 6 glazed and 9 sprinkled donuts for a total of $225. Bob sold 12 glazed and 6 sprinkled for a total of $246. How much does does the donuts cost?