1TH/Vwo §6.5 Comparing graphs

§6.5 Comparing graphs
1 / 23
next
Slide 1: Slide
WiskundeMiddelbare schoolhavo, vwoLeerjaar 1

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

time-iconLesson 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
Task 1:
After how many days is the price 
you pay at Praxis 
the same as at Finefix?
Key in in next slide.

Slide 5 - Slide

Task 1:
After how many days is the price
you pay at Praxis
the same as at Finefix?
Key in your answer.

Slide 6 - Open question

exercise 
Task 2:
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 ,
Task 2:
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 
Task 3:
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,
Task 3:
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 12 - Slide

Slide 13 - Slide

exercise 
Task 4:
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 ,
Task 4:
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 this task ?
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

Slide 23 - Slide