1. Algebra 2 September 16, 2018 Goals:
Identify functions in coordinate, table, or graph form
Determine domain and range of given functions

2. Function Vocabulary
Relation: a mapping or pairing of input values with output values
Function: a relation for which each input has exactly ONE OUTPUT
Domain: the set of input, or x values
Range: the set of output, or y values

3. Function Tests Determine whether a relation is a function by:
Checking the input/output values (the x-values should NOT repeat)
Using a vertical line test (a vertical line should not intersect the given graph in more than 1 point at any given time)

4. Identify Functions EXAMPLE 1
Consider this relation: (−2, −3), (−1, 1), (1, 3), (2, −2), and (3, 1)
What is the domain?
What is the range?
Is it a function?
Represent the relation using a graph and a mapping diagram.

5. Identify Functions EXAMPLE 2
Tell whether the given relations are functions. Explain. -3 -1 2 4 3 -4 -2 1 4 -4 -1 2 3

6. Identifying Functions