1. Chapter 2 Section 1 Relations and Functions Algebra 2 Notes January 8, 2009

2. Warm-Ups/Quiz Review!! Evaluate the expression for the given value: Simplify by combining like terms Solve the following equations for x

3. Quiz Review cont… A dog kennel owner has 100ft of fencing to enclose a rectangular dog run. She wants it to be 5 times as long as it is wide. Find the dimensions of the dog run.

4. Chapter 2 Section 1 Graphing a Relation Relation: a set of pairs of input and output values. You can write a relation as a set of ordered pairs Relation {(-2, 4), (3, -2), (-1, 0), (1, 5)} Graph this relation on a coordinate plane Input (x-values) Output (y-values)

5. Finding Domain and Range The domain of a relation is the set of all inputs. The range of a relation is the set of all outputs. {(2, 4), (3, 4.5), (4, 7.5), (5, 7), (6, 5), (6, 7.5)}

6. Identifying a Function Function: for one domain value (x) there is one and only one range value (y) Determine whether or not this relation is a function. Use a mapping. {(-1, 2), (3, 6), (-5, -10), (3, 2)} -5 3 -5 3 -10 -2 2 6 -10 -2 2 6 Domain Range

7. Evaluating Functions Use the following function to find

8. Homework #3 Chapter 2 Section 1 Pg 59 #1, 2, 7, 12, 13, 16, 17, 20-23, 32, 40-42, 55, 56