1TH/Vwo §3.4 Plotting graphs

A good look back at §3.3 first!
OPEN YOUR NOTEBOOK and 
SHOW ME:            EXERCISES 20 and 21
I will have a look at your work and 
we will go through the content (= inhoud) soon.
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WiskundeMiddelbare schoolhavo, vwoLeerjaar 1

This lesson contains 32 slides, with text slides.

time-iconLesson duration is: 60 min

Items in this lesson

A good look back at §3.3 first!
OPEN YOUR NOTEBOOK and 
SHOW ME:            EXERCISES 20 and 21
I will have a look at your work and 
we will go through the content (= inhoud) soon.

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§3.4 Plotting graphs
You're going to plot (= draw) a few graphs today!
By the way, your ipad stays in the bag, as you don't need it for this Lessonup!



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an interesting exercise ...  
                  we will do soon!
+ take before you:            
      a.  Notebook
      b.   pen
      c.   pencil   and
      d.   geo triangle (or ruler), from your bag and pencil case!

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an interesting exercise ...  
                  we will do soon!
First the METHOD for making good graphs is shown!  
It's a lot of information.
Don't worry about it, but
- try to follow it as good as you can
- make the tasks that follows and 
- after this you will see the METHOD once more 

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Abov


Above the general way to make a GRAPH from a TABLE is shown!
Next slide gives an example.

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Schermafbeelding 2020-10-12 om 13.27.34

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Schermafbeelding 2020-10-12 om 13.27.55

 DRAW the HORIZONTAL axis.     
USE A PENCIL and a PENCIL ONLY !!!   (the numbers and words may be written with a pen)
Look at the lowest age in the table:  it is 6 years.
So: start your horizontal axis at 6 years!  See next slide.
However: 
               take 10 cm for the VERTICAL axis!

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22a Below you see how the HORIZONTAL axis is drawn.
Once more: make sure you have about 10 cm for the VERTICAL axis!

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Think it over and compare your idea with your neighbor.
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0:45

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Answer 22b:
Because of two reasons:
1st:    the numbers 0 to 20 you don't need in the graph.
2nd:  steps of 5 make sure that your graph doesn't get too high!
       To be concrete: if you use 1 cm for 1 kg, then your vertical axis will be
       about 60 cm high!!


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like the river in the previous slide .....
our activities keep flowing !
Just go with the flow!

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S
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Answer to 22c:
If you think:
variable= kg     and    unit =   weight,    
          then   raise 2 fingers
variable = weight   and   unit = kg,           
           then  raise 4 fingers.

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Answer and Explanation 22c:
variable = weight
and       unit (eenheid) = kg    ,
so 4 FINGERS was correct!
A VARIABLE (something that changes over time, in this case weight) 
is expressed in a UNIT (in this case kg)!



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     So go ahead and draw. Don't forget the ZIGZAG for 0 - 20 kg!
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In the next slide ....
+ you see the complete graph already
+ but for now it's only about the axes! 

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Now do tasks e and f!
In the next slide you see the whole task again!

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Abov


Above the general way to make a GRAPH from a TABLE is shown!
Next slide gives an example.

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TASK:
In the GRAPH in the following slide
there is something NEW.            I've got 2 questions about it:
1st What's new?! 
 2nd What is the great thing about this ? 
          In other words: what can you do, having two graphs in one coordinate system?
Discuss this with your neighbor!

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Answer:
1st   Two graphs are shown.
2nd  The great thing about this is that you can
COMPARE (vergelijken) them!!     

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Homework time
Do:
§3.4 Plotting graphs, you may SKIP 22 and 23.

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