1. Section 2.7 – Absolute Value The table shows the numbers of hours students spent online the day before a test and the scores on the test. Make a scatter plot. How would you describe the correlation? How much would you expect to pay for electricity if the average temperature was 70 degrees? Explain.

2. Section 2.7 – Absolute Value There is a family of functions related to the one you represented in the Solve It.

3. Section 2.7 – Absolute Value Essential Understanding Just as the absolute value of x is its distance from 0, the absolute value of f(x), or |f(x)|, gives the distance from the line y = 0 for each value of f(x).

4. Section 2.7 – Absolute Value The simplest example of an absolute value function is f(x) = |x|. The graph of the absolute value of a linear function in two variables is V-shaped and symmetric about a vertical line called the axis of symmetry. Such a graph has either a single maximum point or a single minimum point, called the vertex.

5. Section 2.7 – Absolute Value

6. Problem 1: What is the graph of the absolute value function y = |x| - 4? How is this graph different from the graph of the parent function f(x) = |x|?

7. Section 2.7 – Absolute Value

8. Problem 1: What is the graph of the absolute value function y = |x| + 2? How is this graph different from the graph of the parent function f(x) = |x|? Do transformations of the form y = |x| + k affect the axis of symmetry? Explain.

9. Section 2.7 – Absolute Value

10. Problem 2: Multiple Choice Which of the following is the graph of y = |x + 2| + 3?

11. Section 2.7 – Absolute Value Problem 2: What is the graph of y = |x - 2| + 1?

12. Section 2.7 – Absolute Value The right branch of the graph of y = |x| has slope of 1. The graph of y = a|x|, a > 0, is a stretch or compression of the graph y = |x|. Its right branch has a slope a. The graph of y = -a|x| is a reflection of y = a|x| in the x-axis and its right branch has a slope of –a.

13. Section 2.7 – Absolute Value Problem 3: What is the graph of y = ½ |x|? What is the graph of y = 2|x|? What is the graph of y = -2/3|x|

14. Section 2.7 – Absolute Value

15. Problem 4: Without graphing, what are the vertex and axis of symmetry of the graph of y = 3|x – 2| + 4? How is the parent function transformed?

16. Section 2.7 – Absolute Value Problem 4: Without graphing, what are the vertex and axis of symmetry of the graph of y = -2|x – 1| - 3? How is the parent function transformed?

17. Section 2.7 – Absolute Value Problem 5: What is the equation of the absolute value function?

18. Section 2.7 – Absolute Value Problem 5: What is the equation of the absolute value function?

19. Section 2.7 – Absolute Value Problem 6: Graph the function: y = |-¼x – 1|

20. Section 2.7 – Absolute Value Problem 6: Graph the function: y = 6 - |3x|

21. Section 2.7 – Absolute Value Problem 6: Graph the function: y = 6 - |3x+1|

22. Section 2.7 – Absolute Value Problem 6: Graph the function: y = |3x| - x/3

23. Section 2.7 – Absolute Value Problem 6: Graph the function: y = ½|x| + 4|x – 1|

24. Section 2.7 – Absolute Value Lesson Check

25. Section 2.7 – Absolute Value Lesson Check