Function- f from a set A to a set B is a relation that assigns to each element x in the set A exactly one element y in the set B. The set A is the doman ( or set of inputs) of the function f, and the set B contains the range ( or set of outputs).
Functions can be expressed Verbally, Numerically, Graphically, and Algebraically
Use the vertical line test to check if there is a function on a graph. If the line passes 2 points then there are two of the same x values, therefore it is not a function.
Function Notation-
y is a function of x
y = f (x) ↔ The point (x, y) is on the graph f
Example- f (x)= 3x+10
f (2)= 3(2)+10
f (2)=16
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