Functions and Relations Flashcards
Grade 9 · Math · Flashcards
Key terms for understanding functions, notation, domain, and range in Grade 9 Math.
Flashcards
- Relation
- Any set of ordered pairs (x, y)
- Function
- A relation where each input has exactly one output
- f(x) notation
- Read 'f of x' — indicates the output for a given input x
- Evaluating a function
- Plugging a number in for x to calculate the output
- Domain
- All allowable input (x) values
- Range
- All possible output (y) values
- Vertical line test
- Graph is a function if no vertical line crosses it more than once
- Input
- The x-value fed into a function
- Output
- The y-value (or f(x)) produced by a function
- One-to-one
- Each input maps to a unique output AND each output comes from a unique input
- Mapping diagram
- A diagram showing arrows from each input to its output; visualizes a function
- Piecewise function
- A function defined by different rules for different parts of the domain
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