1TH/Vwo §6.1 6.2 6.3 !

• Wiskunde
• Middelbare school
• havo, vwo
• Leerjaar 1

Ch 6:    §6.1   6.2   6.3 

You've learnt a lot about Word Formulas

already.

However, in order to make sure you really understand the first 3 paragraphs,

here's some more practice!

Get organised first!

+ open your Notebook and take

+ a pencil, pen, ruler, eraser before you

First follows the METHOD how to MAKE A FORMULA from a description (=beschrijving).

Task 1:

Make the formula, take a picture of your work and send it in the next slide.

Work it out

in your Notebook

first!

The formula I made is ......

Explanation Task 1

Your Calculation may be a little shorter, as I said.

Most important is the correct formula, of course.

This formula is also correct:

1. attractions x 2.50 + 4 = cost
2. cost = 4 + 2.50 x attractions
3. cost = 2.50 + 4 x attractions
4. attractions x 4 + 2.50 = cost

Task 2: answer question b in next slide

Use the Formula we just made!

Answer Task 2:

1. 31.50 euros
2. 32.00 euros
3. 31.00 euros
4. 32.50 euros

Explanation Task 2:

Task 3:   answer question c in the next slide.

answer Task 3 (question c)
The old formula was:

1. 4 + number of attractions + 3 = cost
2. 4 x number of attractions x 3 = cost
3. number of attractions x 3 + 4 = cost
4. cost = 4 + number of attractions x 3

The next slide is about

WALLPAPERING.

Why?

You will soon see!

Task 4: answer in next slide.

Task 4
The fixed amount is ...

(the formula is: hours x 25 + 40 = cost)

1. 25
2. 40
3. 65
4. 15

explanation Task 4:

(The formula is:

hours x 25 + 40 = cost)

Time for a Joke!

Task 5: Now you're asked to Plot a Graph.

First comes the Method once more!

Task 5: Now you're asked to Plot a Graph.

Make the Table and Graph, take a pic and send it in in the next slide! You may use the PAPER BOOK, p.234: it is exercise E4!

Tip: in the Table take numbers 0, 2, 4, 6, 8 and 10 for the hours.

Task 5 Table and Graph are here:

Solution 

Task 5:

Task 6: Key in your answer in next slide.

Note:The answer for this question you really cannot READ OFF 

accurately from your graph. The answer is NOT a whole number.

Try to solve it with a CALCULATION!

Answer Task 6:

1. 4 hours
2. 4 hours and 5 minutes
3. 4.5 hours
4. 5.4 hours

The calculation plus the final answer:

The formula is:       hours x 25 + 40 = cost

The cost is:              152.50  euros

The calculation runs as follows:

152.50 - 40 = 112.50

112.50 : 25 = 4.5         

So the number of hours is takes is 4.5

Task 7:

Give an example of a LINEAR FORMULA.

Key in in the next slide.

Example Linear Formula:

Solution Task 7:

There are an infinite (=oneindig) number of answers here. Just a few:

-    time in hours x 3  +  15  = money earned in euros

-    cost in euros = 3000  -  15 x tickets sold

-    water level in cm = time in minutes x 15  +  300 

So, you have worked hard on all 3 paragraphs now by this LessonUp.

Hope you did well.

However, most important is that you PRACTISED a lot.

Repetition (=herhaling) is important to really take in something new!

Next slide shows you the Homework.

Use the remaining time well.

Finish 

Book   1B:       p.42/43   P1 t/m P10 (not P7 + P9) and also

Book   1A:       p.241        5 t/m 8