# 1TTO §7.4 Making formulas for graphs

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

Dagopening?
Start right here
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Bijbelstukje

#### Slide 2 -Tekstslide

§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!

#### Slide 3 -Tekstslide

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!

#### Slide 4 -Tekstslide

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

#### Slide 6 -Tekstslide

By chance is decided who gives the answer
to this question.
Finally we all write down the correct answer.

#### Slide 7 -Tekstslide

The graph starts at (0,0)  or  the origin.
(That's the same.)

#### Slide 9 -Tekstslide

At question c,
a short Calculation is needed!
So, ..........., tell us how to calculate

Now question d.

#### Slide 12 -Tekstslide

The formula becomes:
'length x 0.80 = price'
So ' 0.80 ' had to be filled in.

#### Slide 13 -Tekstslide

Suppose you don't have any start of a Formula.
You only have a Graph.
How to make the Formula now? See next slides.

#### Slide 16 -Tekstslide

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!
timer
5:00

#### Slide 17 -Tekstslide

+ here's the exercise,
that is also in your book,
of course.

Solution 28a:

#### Slide 19 -Tekstslide

Homework time, doing §7.4.

#### Slide 20 -Tekstslide

Part 2 making formulas

S28

#### Slide 22 -Tekstslide

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)

Tekst