The graph represents the cost associated with producing a given number of tortillas, there are two scenarios, handmade and machine-made tortillas, for the handmade scenario, we can see that as the number of tortillas increases the cost remains the same, and for the machine-made scenario, we can see that as the number of tortillas increases, the cost decreases.
The point of intersection, in this case, is the cost associated with producing 0 tortillas, this can be interpreted for the machine-made case as the cost of starting the equipment (the machine) that makes the tortillas.