During the thirteenth week of Foundations of Mathematics and Pre-Calculus, I learned how to identify functions. Identifying functions is not to difficult, there are only a few things you need to do. The ways to can identify functions are arrow diagrams, ordered pairs, and graphs. On arrow diagrams, if one input is mapped to more than one output, it’s not a function. For ordered pairs, if the input value is repeated, it’s not a function. Finally, for graphs any vertical line that crosses the graph at more than one place, it’s not a function. This method is called the vertical line test. Some things to know first are: input, output, domain, and range.
Mapping Example:
Ordered Pairs Example:
Graph Example:
Which ones are functions?
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