# 1H/Vwo §6.5 Grafieken vergelijken

§6.5 Comparing graphs
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Slide 1: Slide
WiskundeMiddelbare schoolhavo, vwoLeerjaar 1

This lesson contains 23 slides, with interactive quizzes and text slides.

Lesson duration is: 50 min

## Items in this lesson

§6.5 Comparing graphs

#### Slide 1 -Slide

Let's go through an exercise!

#### Slide 2 -Slide

exercise
This graph shows you
the cost when
hiring a lawn mower
(=grasmaaier).

#### Slide 3 -Slide

exercise
Because 2 graphs are drawn in 1
coordinate system,
we can COMPARE them!

#### Slide 4 -Slide

exercise 32
After how many days is the price
you pay at Praxis
the same as at Finefix?
Key in in next slide.

#### Slide 5 -Slide

After how many days is the price
you pay at Praxis
the same as at Finefix?

#### Slide 6 -Open question

exercise 32
If you hire a lawn mower
for 2 days, which company is
cheapest?
Answer in next slide.

#### Slide 7 -Slide

For 2 days ....
A
better choose for Praxis
B
it depends
C
better choose for Finefix
D
doesn't matter

#### Slide 8 -Quiz

Explanation exercise 32,
If you hire a lawn mower for 2 days, what is
the cheapest?
1. Go to '2 days' on the horizontal axis.
2. Go up and see which graph is highest.
3. Well, Finefix' graph lies lower,
4. so Finefix is cheapest for 2 days!

#### Slide 9 -Slide

exercise 32
If you hire a lawn mower for 5 days,
which company is cheapest then?
Key in in next slide.

#### Slide 10 -Slide

For 5 days ...
A
Praxis is cheapest.
B
Doesn't matter.
C
Finefix is cheapest.
D
idk

#### Slide 11 -Quiz

Explanation exercise 32,
If you hire a lawn mower for 5 days,
which company, which is cheapest?
Go to 5 days on the horizontal axis.
Go up and see which graph lies lowest.
Praxis' graph is lowest for 5 days,
so then the price is lowest too!

#### Slide 13 -Slide

exercise
Which graph has a fixed amount?
That is the amount you have to pay,
no matter how many days they will work
for you!

#### Slide 14 -Slide

A fixed amount ...
A
Graph for Praxis has one.
B
No clue at all.
C
Graph for Finefix has one.
D
Both graphs have one.

#### Slide 15 -Quiz

Explanation exercise 32,
Which graph has a fixed amount?
The graph for Praxis starts at 10 euros.
That's what you have to pay before you have used
this carpet cleaner for even one minute!
That's why we call this a FIXED AMOUNT.
The amount is fixed, no matter how long you use it.

#### Slide 16 -Slide

Question: What to do first, when making 33a ?
ANS

#### Slide 17 -Slide

First you have to ....

#### Slide 18 -Mind map

Solution:
Make a TABLE, indeed!
How else do you know which points lie on the graph?!
However, a TIP for this follows now.

#### Slide 19 -Slide

This is how the
SOLUTIONSBOOK does it.
However, why including so may points in the TABLE?
They all lie on the same straight line!
So 3 or 4 points will be enough.

#### Slide 20 -Slide

In this lesson you have learned .....
I'd much better ASK YOU, what you've learned!
Think of a 'general description' (=algemene beschrijving) for what you learned.

#### Slide 21 -Slide

I have learnt ...

#### Slide 22 -Mind map

Homework time
Make §6.5. You may skip 30.
- correct with Solutionsbook
- take some pics and
- send in the lot in GC