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Understand that a function from one set (called the domain) to another set (called the range) assigns to each element of the domain exactly one element of the range. If $f$ is a function and $x$ is an element of its domain, then $f(x)$ denotes the output of $f$ corresponding to the input $x$. The graph of $f$ is the graph of the equation $y = f(x)$.


Do two points always determine a linear function?
The Parking Lot
Your Father
Parabolas and Inverse Functions
Using Function Notation I
The Customers
Points on a graph
Finding the domain