2TH/vwo §1.2 Formulas for straight lines

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§1.2 Formulas for straight lines
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Slide 1: Tekstslide
WiskundeMiddelbare schoolhavo, vwoLeerjaar 2

In deze les zitten 22 slides, met interactieve quizzen en tekstslides.

time-iconLesduur is: 45 min

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Today:
§1.2 Formulas for straight lines

Slide 1 - Tekstslide

 om 21.22.41
Schermafbeelding 2021-07-28 om 21.23.01

Slide 2 - Tekstslide

You will also learn:

Slide 3 - Tekstslide

I'm afraid these goals will not make much sense yet,
so let's just start with an exercise!

Slide 4 - Tekstslide

First of all...
take before you:
- pencil, geo and eraser
- Textbook 2A p.14/15
- Notebook

Slide 5 - Tekstslide

Use the right materials for this task:
a pencil and geo triangle for drawing the table and a pen for the numbers!

timer
1:00

Slide 6 - Tekstslide

Solution:

Slide 7 - Tekstslide

Now do 9b:


Again use the right stuff:
a pencil and a geo!
Then an important thing: what numbers to write on the horizontal axis
and what numbers on the vertical axis?!   For this study the table well! 

timer
1:00

Slide 8 - Tekstslide

Solution:

Slide 9 - Tekstslide

Think about these questions and try to solve them:
timer
1:00

Slide 10 - Tekstslide

Solutions  9c + 9d:



     After this, time for a joke!

Slide 11 - Tekstslide

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Slide 15 - Tekstslide

Maybe you think:
y = 3.   has no gradient at all, so it cannot be 0 ?!
Still, it HAS a gradient, because you can also write it as:
y = 0x + 3
Because 0 times x = 0x = 0, you can leave this term out.

Slide 16 - Tekstslide

Task:
Make a linear formula for a Rising Graph.
So use this shape:
y = ax + b
(You have to find suitable numbers for a and b yourself.)
ANS

Slide 17 - Tekstslide

timer
0:45
A formula for a rising graph:

Slide 18 - Woordweb

Solution:
A rising graph, so the number for the letter a in
y = ax + b 
has to be positive!
For example:    y = 3x -6

Slide 19 - Tekstslide

The graph for y = 6 -4x
is a ....... graph.
A
rising
B
falling
C
horizontal
D
vertical

Slide 20 - Quizvraag

y = 6 -4x   has a 
Falling Graph, because of the number -4, that stands for 
the letter a in the general shape:
y = b + ax
( y = ax + b    and   y = b + ax  come down to the same thing!)

Slide 21 - Tekstslide

Homework:
As usual:
Havo, make the Support path
Vwo, do the Standard or Challenge path
ALL MAY SKIP:  9 and 10.
DRAW THE GRAPHS WITH A PENCIL AND A GEO TRIANGLE OR RULER!

Slide 22 - Tekstslide