What is the slope of the line that passes through the points (4,-7) and (9, 1)?
A) 5/8
B) 8/5
C) -6/12
D)-13/6

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?