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Math·Algebra·Linear functions

hard

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?

A

Each game costs $18.

B

The video game system costs $18.

C

Each game costs $150.

D

The video game system costs $150.