Assume the supply function for good X can be written as Qs = -100 + 27Px - 5Py - 1.8W, where px=the price of x, Py=the price of good y, and w = wage index for workers in industry x. According to this equation: 1. each one unit increase in price causes quantity supplied to increase by 73 units. 2. x and y are complements. 3. x and y are substitutes 4. decrease in wages would cause a decrease in the quantity supplied at each price.