Find the equation of the line (in slope intercept-form) that contains point (-3, 4) and is perpendicular to y = 2x + 4
Show work please

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?