3Thavo Ch 7 REFRESH

• Wiskunde
• Middelbare school
• havo
• Leerjaar 3

This lesson is about:

Ch 7 Types of relations,

REFRESH, p.244/245

Open your textbook on p.244/245 and write down:

'Ch 7 Types of relations

R1 a                    3q - 12 = 24'

Then solve this equation, step by step!

The answer to
R1a 3q - 12 = 24 is

1. q = 4
2. q = -4
3. q = 12
4. q = -12

Solution:

Compare the following solution, then correct if needed!

R1a   3q - 12 = 24

3q = 36

q = 12

Let's read 'Theory', p.244 together.

The good old lollypopsticks will decide who is going to read this aloud!

Do R2 a yourself now:

Write down in your Notebook why you think there is (no) linear relation!

The answer to R2a is:

1. No, because the steps in the top row are not +1.
2. No, because there is no 0 in the top row.
3. Yes, because on top it goes +3 and in the bottom it goes +8.
4. Yes, because it is a rising line.

Solution R2a:

The increase in the top row is +3 all the time.

The increase in the bottom row is +8 all the time.

That means there is a linear relation.

(When you would draw its graph, you get a straight, rising line.)

Time to do some Homework!

Go back to R1, solving the equations. Then go to R2, etc.

But first....

See next slide.

Good luck!

Later this lesson we will continue this LessonUp.

A short look at:

page 245.

Who reads 'Theory', p.245 ?

Fate - or better: the lollipopsticks!- will decide this.

Make your own:

Exponential relation - FORMULA!

Key in your Formula!

Theory, p.245

Your teacher will read this vital text this time.

Follow this carefully and ask a question, if it is not clear to you!

Let's tackle R7 now!

Do R7 for yourself, in your Notebook.

Answer to R7a:

1. A
2. B
3. D
4. C

Explanation R7a:

Formula C you can also write as:

y = 10 

(because 1 to the power of whatever is still 1!),

and that corresponds to a straight horizontal line, like 3.

Answers to R7b:

1. A - 1, B - 2, D - 4
2. A - 2, B - 1, D - 4
3. A - 1, B - 4, D - 2
4. A - 4, B - 1, D - 2

Explanation R7b:

- The Graph for Formula A starts at the height of 10 and is increasing, so:   Graph 1.

- The Graph for Formula B starts at 10 too, but it is decreasing , so:

Graph 4.

- The Graph for Formula 2 starts at 3 only and it increases, so:

Graph 2.

 

Continue

doing the Homework:

REFRESH, p.244/245.

What did you learn this lesson?