A cart has 5 boxes on it. Each box weighs 70 pounds. The boxes will be removed from
 the cart, one at a time. Which function models the relationship between x, the number of
 boxes that have been removed from the cart, and y, the total weight, in pounds, of the
 boxes remaining on the cart?
 y=-70x+5
 B) y = -5x + 350
 y = 50x + 70
 = 52 +350
 D) y =
 Y =