2Tvwo Ch9 REFRESH

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 2

Ch 9 REFRESH

First some questions to see what you still know 

from 1st Form,

because the content from this § is taken from Books

1A and 1B.

But it has been a while since you worked with those books...

What is a linear formula?

Possible answers:

It is a formula for which the graph is a straight line.

                                                          or:

It is a formula with two variables, that corresponds to a straight line.

y = -5x + 6

Which statement(s) is (are) true?

A. 6 is the y-intercept                B. -5 is the y-intercept

C. 6 is the gradient                   D. -5 is the gradient

Choose your answer in the next slide!

y = -5x + 6

1. 6 = y-intercept
2. -5 = y-intercept
3. 6 = gradient
4. -5 = gradient

So, to refresh your memory: 

Write without brackets:

Write without brackets: 

u = 6 (3p + 5)

a. 9p + 11                                       b. 18p + 30

c. 30 + 18p                                   d. 48p

Key in in next slide! 

Work out = 6(3p + 5)

1. u = 9p + 11
2. u = 18p + 30
3. u = 30 + 18p
4. u = 48p

Answers:   

There are (at least) two ways of solving this!

+ with a Multiplication Table or

+ with the Parrot's Beak

Solution 1 (mutiplication table):

Solution 2 (parrot's beak):

The final topic of the Refresh:

Instruction Movie (dutch):

https://wiskundeacademie.nl/havo-2-vwo-2/vergelijkingen-oplossen-met-de-balansmethode

After this LessonUp, 

Watch this fine Movie!

It makes very clear how to solve equations.

From this movie you've learned how to do R5:

The following is very important:

Solving such an equation cannot be like this:

                                                      ???????

The answer just came 'falling from the sky' !?

Solving means working out, step by step, as below:

The Method used, here, it called:

the CARD method.

Do you remember from 1st Form?!

Homework time.

The best of luck, doing Refresh Ch 9, p.86/87.

I am going to comment on your Homework now.

If you are stuck and need a little help:

I am around and available to answer you by mail!

Don't hesitate to ask.