Which unit rate is the lowest price per ounce

Choice A:15 ounces of chocolate chips for $2.49
Choice B:20 ounces of chocolate chips $3.32

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?

When only separate discreet points are graphed it is called?

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=