Math question on the picture please help

Ill mark the brainliest if you me with the these three questions 7,8,9

Y= 4x + 3 y = - 1 4 x - 5 what is the best description for the lines represented by the equations?

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?