3Tvwo § 5.5 Sum and Difference functions

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 3

§ 5.5 Sum and difference functions

We start doing exercise 28 together.

This saves you making a few graphs...

Open your book on p.174/175

28a Choose the right formula in the next slide!

Answer 28a

1. a = 10.50n
2. a = 0.50n + 10
3. a = 50n + 10
4. a = 10 + 0.50n

About 28b, What is there to say about both graphs?

1. the graphs have no point of intersection
2. the graphs are rising
3. the graphs are parallel
4. the graphs straight lines

Question about 28d:
Compare the 'total amount graph' to the graphs of 28b:

1. This graph is falling.
2. All 3 graphs have the same point of intersection.
3. This graph is not a straight line.
4. This graph is a SUM GRAPH.

28d (again)

Look at the graph now:

Do 29 and further, yourself.

a. Forgotten your Workbook?

Copy the graphs of 29 (and later 32) in your Notebook! 

b. After you have done 29, do not forget to STUDY carefully:

THEORY on the same page!

c. First of all: a JOKE, of course!

Now Do:  § 5.5 (not 28, of course)

Work for 20 minutes in a row!

Exercise 31:
What does the REVENUE mean?

1. somebody who returns
2. a meeting place
3. a loss
4. a profit

Explanation previous slide:

Exercise 32:

+ The REVENUE is the price the buyer pays. (a revenant is sb         who has returned;  a venue is a meeting place)

+ the COST has to be subtracted, to get 

+ the PROFIT.                        and now for Exercise 32: next slide!

A tip for 32b

Make a table first:

only fill in these numbers for x :

      -1,       0,      0.5,   and   2

                                                         

What did you learn this lesson?