What does the y intercept of the graph tell you?

Question

The cost of manufacturing DVDs is given by C=20000+5x, where x is the number of DVDs manufactured.  What does the y intercept of the graph tell you?

Answer 1

The y intercept is found by setting x to 0.  What does that mean in this case?  x is the number of DVD's manufactured.  If we set that to 0, our costs are still $20,000.  What this seems to mean is that it will cost us $20,000 just to get the company up and running, and ready to produce that first DVD.  I would call that intercept "startup costs", that would typically include renting the facility, purchasing equipment, etc.