1TTO §7.4 Making formulas for graphs

• Wiskunde
• Middelbare school
• havo, vwo
• Leerjaar 1

§7.4 Making formulas for graphs

This subject, MAKING them yourself, is sometimes found the most difficult from the whole chapter.

However the book gives us a clear strategy how to do this.

First of all: straight lines ->  y = 0x + 3   

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§7.4 Making formulas for graphs

This subject, MAKING them yourself, is sometimes found the most difficult from the whole chapter.

However the book gives us a clear strategy how to do this.

So pay attention well!

Video Moderne Wiskunde  (site !)

Video Wiskundeacademie

First of all...

Take the usual materials before you:

+ Notebook, Textbook

+ Pen, pencil, geo triangle

+ Because we are going to do the first homework exercise 25, p.218 now!

Exercise 25, p.218 we make together, now.

+ Think hard about every question.

+ Everyone may get the turn to give the answer.

+ Write down the correct result in your Notebook. 

8

By chance is decided who gives the answer

to this question.

Finally we all write down the correct answer.

answer to 25a:

The graph starts at (0,0)  or  the origin.

(That's the same.)

answer 25b:

At question c, 

a short Calculation is needed!

So, ..........., tell us how to calculate

the answer.

answer 25c:

Now question d.

Use the answer(s) we already have.

......., what is your answer?

answer 25d:

The formula becomes:

'length x 0.80 = price'

So ' 0.80 ' had to be filled in.

Suppose you don't have any start of a Formula.

You only have a Graph.

How to make the Formula now? See next slides.

Exercise 28 ......

+  You're going to do right now, in your Notebook

+  Keep the Textbook, p.218/219 opened,

+  for following the 4 steps Method, we just discussed.

+  So write down all 4 steps, not just the answer! 

+ here's the exercise, 

 that is also in your book, 

 of course.

Solution 28a:

Compare to your own work and if needed, add or correct!

Homework time, doing §7.4.

Part 2 making formulas

S28

4 Stappen:

1. maak tabel

2. zoek startgetal

3. zoek stijging PER-getal (dus wat gebeurt er als op horizontale as +1 gaat?

4. formule ->   verticaal  =  .........X horizontaal (+ startgetal)

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