Functions
what are functions and how to justify them?
A function f is a rule that assigns to each element x in a set D exactly one element, called f(x), in a set E
For example:
this is a function but be careful the same value in the domain can't take two values of co-domain
to make it easier to justify that the graph is a function is to make a vertical line test
The Vertical Line Test: A curve in the xy-plane is the graph of a function of x if and only if no vertical line intersects the curve more than once
it's when your function is increasing or decreasing
Tags:
calculus