Which equation is graphed in the figure?
a. 3x - 4y - 8 = 0
b. -3x + 4y + 8 = 0
c. 3x + 4y - 8 = 0
d. -3x - 4y - 8 = 0

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?