1. Unit 3
Functions

2. 4.2
Graphs of Functions

3. Essential Question:
How can I “see” a function?

4. How do we determine if it’s a function?
Vertical Line test
Repetition of x-values
Function in f(x) form

5. Is it a function? x2 + y = 1 -x + y2 = 1 x3 + y = 1 -x + y3 = 1

6. Evaluate the following:
When is the graph below the x-axis?
Does the graph represent a function?
What is the domain of the function?
What is the range of the function?

7. Sketch the following:
y = 7
f(x) = -2x + 5
y = (x – 5)2
y = 2|x| - 3

8. Revisiting the Essential Question:
How can I “see” a function?

9. Homework 4.2
Pg 228 – 230: 1, 6 – 12 even, 20 – 23, 26, 34, 42 – 52 even, 60, 64