Use the GCF and distributive property to find the sum of 30 + 66. help me pls

Graph red beads cost $1 an ounce and gold beads cost $3 an ounce. juanita wants to purchase a 12-ounce mixture of red and gold beads that she can sell for $2 an ounce. the solution of the system shows the number of beads needed for juanita to break even. x + y = 12, x + 3y = 24 how many ounces of red beads will juanita buy to break even? how many ounces of gold beads will she buy?

Me i'm timed right now! a. (0,-5)b. (0,-3)c. (0,3) d. (0,5)

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.