Please NEED NOW Some students are studying graphs of functions y = f(x) and other equations. Each table contains some points on a particular graph. Decide whether each set of points might be on the graph of a function or cannot be on the graph of a function.

Becca wants to mix fruit juice and soda to make a punch. she can buy fruit juice for $3 a gallon and soda for $4 a gallon. if she wants to make 28 gallons of punch at a cost of $3.25 a gallon, how many gallons of fruit juice and how many gallons of soda should she buy?