1. Getting a Line on the Pattern
Section 3.2
Getting a Line on the Pattern

2. Lines as Summaries
What is the slope of a line?

3. Lines as Summaries
Slope of a line is a ratio of the vertical change to the horizontal change.

4. Lines as Summaries
For any two points (x1, y1) and (x2, y2) on a line, the slope is constant.
Slope =

5. Lines as Summaries
What is the slope-intercept form for the equation of a line?

6. Lines as Summaries
What is the slope-intercept form for the equation of a line?
y = mx + b
where m is slope and b is y-intercept

7. Lines as Summaries y = mx + b
where m is the slope and b is the y-intercept
Important note: In statistics, we write
y = a + bx
where b is the slope and a is the y-intercept
Why the change?

8. Lines as Summaries Important note: In statistics, we write y = a + bx
where b is the slope and a is the y-intercept
Sometimes multiple variables are being studied so we would have:
y = a + b1x1 + b2x2 + b3x

9. Activity 3.2a, page 117 Use Fathom to accomplish this activity.
- May work with up to three in a group
- - Due at beginning of class tomorrow

10. Activity 3.2a, page 117 Follow directions!
Pinch 50 sheets of paper, not up to page 50.

11. Repeat that step for the cover plus 100, 150, 200, and 250 sheets.
Each person answers questions on lab handout and attaches a 1-page printout with copy of case table and graph showing appropriate line

12. Questions?
Due tomorrow