Which property of equality would be used to solve 3x = 81? addition subtraction multiplication division

Why do interests rates on loans to be lower in a weak economy than in a strong one

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 with this one question, and i'll upvote the brainliest answer