Mashaal Masha
The graph of the function $f$, where $y=f(x)$, gives the total cost $y$, in dollars, for a certain video game system and $x$ games. What is the best interpretation of the slope of the graph in this context?

 

Difficulty: Medium
A: 

Each game costs $25.

B: 

The video game system costs $100.

C: 

The video game system costs $25.

D: 

Each game costs $100.

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