# 1TH/Vwo §6.4 Making formulas for graphs (long version)

§6.4 Making formulas for graphs
This subject, MAKING FORMULAS yourself, is sometimes found the most difficult of the whole chapter.
However the book gives us a clear strategy how to do this.
In this LessonUp we will use this clear strategy, of course.
So pay attention well!

1 / 22
Slide 1: Tekstslide
WiskundeMiddelbare schoolhavo, vwoLeerjaar 1

In deze les zitten 22 slides, met interactieve quizzen en tekstslides.

Lesduur is: 50 min

## Onderdelen in deze les

§6.4 Making formulas for graphs
This subject, MAKING FORMULAS yourself, is sometimes found the most difficult of the whole chapter.
However the book gives us a clear strategy how to do this.
In this LessonUp we will use this clear strategy, of course.
So pay attention well!

#### Slide 1 -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 2 -Tekstslide

Exercise 25 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.

#### Slide 3 -Tekstslide

Chance decides who gives the answer
to this question.
Finally we all write down the correct answer.
timer
0:15

#### Slide 4 -Tekstslide

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

8

Now 25b
timer
0:15

#### Slide 7 -Tekstslide

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

Now question d.
timer
0:20

#### Slide 10 -Tekstslide

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

#### Slide 12 -Tekstslide

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

#### Slide 15 -Tekstslide

H1X:
Now do 26  and further.
Next lesson, at 13.00, we move on with §7.4!

#### Slide 16 -Tekstslide

Exercise 28 ......
+  You're going to do right now, in your Notebook.
+ When finished, take a pic of your work and send it in in the next slide!
+  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!
+ If you are finished quickly, then do 28b and c.
timer
4:00

#### Slide 17 -Tekstslide

+ here's the exercise,
that is also in your book,
of course.
+ now we go back one slide,
because there's the Timer and the
Instruction.

#### Slide 18 -Tekstslide

This is my 28a solution:
(next slide gives the 'official solution'.)

Solution 28a: