Please help with this pizzazz work sheet!!

Im completely lost

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

Arestaurant chef made 1 1/2 jars of pasta sauce. each serving of pasta requires 1/2 of a jar of sauce. how many servings of pasta will the chef be able to prepare using the sauce?

15 liters is approximately how many gallons