How do you determine whether the situation is an example of an inverse or direct variation: the spring family buys several lemonades for $1.50 each?
Assuming that the price of the lemonade is not reduced by purchasing several lemonades the cost of several lemonades will be a direct variation. The more lemonades purchased the higher the cost.
However if the question is what is the cost of a single lemonade then the answer could be an inverse relationship. Often the cost per lemonade or other item goes down with the more items that are purchased.
It could be the cost of one lemonade is 1.50 However it is possible that three lemonades could be purchased for 3.00. This would lower the cost per item to 1.00 per lemonade. The cost per item would then be an inverse relationship. The more items purchased the lower the cost per item.