# 1TTO §7.2 Graphs from formulas

1TH/vwo §7.2 Graphs from formulas

Many TABLES to be made and many
GRAPHS to be drawn this paragraph.
First we do a part of the paragraph together.
If you participate well, you may SKIP a few exercises from the paragraph.
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Slide 1: Tekstslide
WiskundeMiddelbare schoolhavo, vwoLeerjaar 1

In deze les zitten 29 slides, met interactieve quizzen en tekstslides. Lesduur is: 50 min

## Onderdelen in deze les

1TH/vwo §7.2 Graphs from formulas

Many TABLES to be made and many
GRAPHS to be drawn this paragraph.
First we do a part of the paragraph together.
If you participate well, you may SKIP a few exercises from the paragraph.

#### Slide 1 -Tekstslide

Materials ....
+ Take before you the right things:
+ pencil, pen, geo triangle or ruler, eraser
+ Notebook and Textbook 1A

#### Slide 2 -Tekstslide

7
This was the Theory.
Next slide shows us an example.

6

5

#### Slide 5 -Tekstslide

Steps of 60 is fine, because ...
A
you have to put 300 on the axis; then you need 300 : 60 = 5 cm.
B
the time goes from 0 to 5
C
the distances go up by 60 all the time
D
there is no zigzag needed

#### Slide 6 -Quizvraag

What to do first, before plotting the graph?

First you ....

Solution:
First you ...
MAKE A TABLE !
As follows:

#### Slide 10 -Tekstslide

1
You may skip exercises 9, 10 and 11.
Now start doing 12, by copying and filling in the Table above!

#### Slide 11 -Tekstslide

Note: only the even number are used, because otherwise there would be 15 numbers...

#### Slide 12 -Tekstslide

Question: Is a 'zigzag' a good idea or not?

#### Slide 13 -Tekstslide

A zigzag: a good idea? (Why?)
A
no
B
yes

#### Slide 14 -Quizvraag

Solution:

Yes. Because the height only starts at 120 cm.
(By the way: the Solutionsbook does not do this!)

#### Slide 15 -Tekstslide

Question: What is a good scale for the corresponding Graph?
Why? For the answer see next slide.

#### Slide 16 -Tekstslide

Homework time
Do of §7.2 now: 11, 12 and 13
Plotting good Graphs, using a pencil and a geo/ruler.
1.make it
2.correct your work with the Solutionsbook
4.send them in in Magister

#### Slide 17 -Tekstslide

Question: What is a good scale for the vertical axis
of the corresponding Graph?
Solution: 260 - 120 = 140
140 : 20 = 7 , so if you use as a scale:
20 cm in table = 1 cm in graph, then you need 7 cm.
That's fine.

#### Slide 18 -Tekstslide

Now PLOT the GRAPH!   Remember:
1.  a zigzag at height 160 cm
2. scale on vertical axis: 20 cm in 1 cm.
Make your teacher happy: draw a beautiful graph!

#### Slide 20 -Tekstslide

In this exercise you can see that 2 Graphs are plotted, in THE SAME COORDINATE SYSTEM!
NOTE 1:   First a handy TIP about the Tables:
USE a DOUBLE TABLE - saves you some work.
NOTE 2:  An important remark in 13a is: 'Take the horizontal axis to 10.'

Part 2 of 7.2

#### Slide 23 -Tekstslide

What special point of both graphs is meant in this question?

#### Slide 24 -Tekstslide

The special point is ....?

#### Slide 25 -Woordweb

Solution:
the point of intersection

Next slide explains us how you can
see from the Formula if the Graph
is Rising or Falling.

Send in S12

#### Slide 28 -Open vraag

Homework time
Do §7.2 now: S14, 14 and 15.
Plotting good Graphs, using a pencil and a geo/ruler.
1.make it
2.correct your work with the Solutionsbook