The horizontal asymptote is the horizontal line that the graph behaves as if it is going to touch as the x-values approaches positive and negative infinity.
From the graph the horizontal asymptote is
As we move towards negative infinity the graph approaches y=-4.
As we move towards positive infinity the graph approaches y=-4.
Sweet and Sour, as 8 quarts is only 2 gallons, for more than half the price ( if they were equal) than the price if the Lovin' Lemon companies lemonade.