Algebra › Section C · Graphs and functions › Topic C.5
Relations and functions
A relation pairs inputs with outputs any way it likes; a function is the well-behaved kind that never gives two answers to one question. The distinction decides which formulas can be trusted to predict.
In this topic
- Relations: any pairing at all
- Reading domain and range from a relation
- Functions: one output per input
- Spotting a function
- Function notation
- Worked example: evaluating a function
- Worked example: a temperature function
- Why one output matters
- Common mistakes to avoid
- Key takeaways
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