Looking for actual answers- not for people who just want points. :,) (still confused, please explain)

2x minus y equals 6, x plus y equals negative 3

Find the value of the variable and the length of each chord for #5 and #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?