1. Warm Up

2. Lesson 25: Differentiating Between Relations and Functions Functions

3. Vocabulary Domain: input values (x-values) Range: output values (y-values) Relation: set of ordered pairs where each number in the domain is matched to one or more numbers in the range Function: mathematical relationship where each value in the domain is mapped to exactly one value in the range

4. Example

7. Vertical Line Test If a relation is graphed on a coordinate plane, the vertical line test can be used to determine if the relation is a function. Vertical line test: if a vertical line intersects a graph in exactly one point, then the graph represents a function.

8. Example Use the table. Graph the ordered pairs on a coordinate grid and determine whether the ordered pairs represent a function.

9. Functions

10. Example

11. A student reads an average of 25 pages per day while reading a 544 page novel. Write a rule in function notation to find the number of pages she has left to read at the end of any given day.

12. Homework questions Questions on the homework?

13. Correcting Homework Be kind. Pay attention If the paper in front of you has 4 or more empty squares, return it to its owner. Write “C.B. ____________” with your name

14. Homework 1 st and 2 nd hour: Lesson 25 #1-30 3 rd hour: Lesson 25 #1-15