Zerlina's Journal Entry

April. 5, 2010 - Interpolation and Extrapolation (Chapter 6)

Today in class I learned how to interpolate and extrapolate. I also learned the difference between them because I honestly didn't know the difference before. Interpolating is when you are given a set of values and you estimate between them.

eg.






When x=2.5 then y=?

Interpolate the given values
y=5






Extrapolating is when you estimate a value beyond a given set of values.

eg.







When y=12 then x=?

Extrapolate beyond given values by extending the line
x=8




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Scribe Post for April 6, 2010

Hey 9-05! Abby here with today's scribe post! Okay let's get started!

Okay so in the beginning of math class, Mr. Backe explained on how to do the 6.1 Math Link.

1. a) Choose one of the following regular polygons for a race course.





So for 1. a), all you have to do is choose one of the polygons. You can choose the triangle, or the square, or the rhombus, or the pentagon. It doesn't matter what you choose, as long as it's one of the four regular polygons!
For an example, I will choose a square.








1. b) Draw and label the five race courses.

• Decide on the length of the side of the first course. (It mus be at least 5 km long.)
• Decide on the length of the sides of the last course. (The longest course must be no longer than 35 km.)
• Decide on the length of the sides of the other courses.
• [!] Each length must be a whole number because the figure numbers are whole numbers.
  

So for 1. b), the regular polygon you chose will become 5 race courses. Since we are using the square for an example.. (sorry for the small picture!)







So, we put course #1, 2, 3, and 4 inside course #5.













And then, we choose a length for the first course. So lets use.. 2 as the length for the first course.














For the second course, the length would be 3 since the second course is larger than the first course. For the third course, the length would be 4, the fourth course would have a length of 5, and the fifth course would have a length of 6.

2. Develop a linear relation that describes the race courses. a) Complete the first two columns in the table of values.
(I'm not going to show the pattern part, just the first two columns)
















So when you have the second column filled out, find out the pattern by multiplying n by __ which will be the numerical coefficient, and add ___ which will be the constant.

So for the rest of the class, we worked on our 6.2 homework.
___________________________________________________

So that ends my scribe post for April 6, 2010! I hope I explained the 6.1 Math Link stuff well. If there are any errors, or something doesn't make sense, please comment! Have a goodnight 9-05! :D

Scribe Post for April 5, 2010

HELLO PEOPLES!! :D Spring Break is finally over, Monday first day back to school (:
how was your Spring Break 9-05? Did you do homework assigned for us over the break? I know...I didn't do it either..I did half (: I hope you guys had a good break though.
k, so first day back to school and we got homework assigned for us already..

• 6.2 workbook
• 6.2 Extra Practice
• 6.2 Textbook
• SYK page 223, 225
• Read Key Ideas
• CYU page 226 #1, place in foldable
• Practise # 4 or 6, 7, 8 or 9 or 10, 11
  
• Apply: ALL
• Extend 18 or 19
• Mathlink page 230 in foldable (use Mathlink handouts for help

ALL DUE Thursday, April 8.
There's possibly a test next week, just reminding everybody! :D

Make sure you guys also did our past homework: ALL OF 6.1 STUFF, so you're caught up.

So we didn't really do anything in class today, we just did questions that we didn't really understand. There were only two:
Check Your Understanding #2:












and Extend #16













I'd explain and review everything but I don't have time, I'm sorry. You guys probably got in class today.

So quick review to freshen up everybody's minds:
Chapter 6: Linear Relations
6.1 - Representing Patterns

Quick Overview...





















I'm sorry I didn't really help. I really don't have time to review the 2 questions and make a better overview of what we're learning.

Scribe Post for March 23, 2010

Hi Classmates! We took some notes today for our brand new unit called LINEAR RELATIONS. Linear relations aren't that difficult once you understand how to do them.

First we took some notes about linear relations.

A linear relation is a relation that appears as a straight line when graphed. Like this...This linear relation is a positive co relation, the points line up, there are no negatives, and the points are ascending (going up). In a negative co relation the points descend (go down) and they involve negatives.

A linear EQUATION though, is an equation whose graph is a straight line. That means that you use the equation to make a graph. An example of a linear equation is

Y=3x+1

Mr. Backe also talked a little bit about parabolas. That is when a graph looks like this;

There is a curve in the graph, Mr. Backe didn't really explain it, so ask him if you are curious about it.

We also learned about pictorial patterns.

Mr. Backe asked us to draw what figure 4 and 5 would be. I drew those in. After that we had to make a table representing the relationship between the figure number and the number of squares.

We realized that the relationship between n and s was that 2 times n subtract 1 would equal s. In order to figure this out, usually you just play around with numbers until you find something that works.

The linear equation for that is s=2n-1. After that we graphed the numbers.

OK, on to homework! (AGGHH)

There is a lot of homework, but don't worry, it's not due until the Monday AFTER Spring Break! That's April 5Th!

HOMEWORK: (In this order)

-Math link Introduction

-Math link 6.1

-Create the Chapter 6 foldable, you ONLY need to make the key words part (linear relation, linear equation, interpolate, and extrapolate) and the side part where is says Interpolation and Extrapolation.

-Read through the beginning of chapter 6, and do CYU 2 and 3, Practise 4 or 5 or 6, then 7 or 8 or 9, Apply 2 of 11-14, and ALL of Extend.

-Workbook 6.1

P.S. make sure you start bringing graph paper to class.

COMMENT, I like comments, they make me feel special, so please comment!

For the next scribe I pick.... Christian!