When can you say that there is no solution for a system of linear equation

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?

The volume of a cube is 8 in to the 3rd power. how long is each side?

17 in long 1.3 ft wide and 8in high what is the volume