# 1TTO 12.4 Linear formulas

§12.4 Linear formulas
The main goal in this paragraph is:
Learning how to make a FORMULA for a LINEAR GRAPH!
See next slide!
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Slide 1: Tekstslide
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In deze les zitten 26 slides, met interactieve quizzen en tekstslides.

Lesduur is: 45 min

## Onderdelen in deze les

§12.4 Linear formulas
The main goal in this paragraph is:
Learning how to make a FORMULA for a LINEAR GRAPH!
See next slide!

#### Slide 1 -Tekstslide

timer
0:25
What is a linear graph?

#### Slide 2 -Woordweb

A linear graph is a straight line
in a coordinate system.

#### Slide 3 -Tekstslide

Point of attention:
Everybody can learn how to make a formula for a linear graph.
However, it takes several steps - 4, in fact! - to do this.
So concentrate and work hard on all the coming slides.
Only then you will get to know 'the whole trick'!

#### Slide 4 -Tekstslide

Take before you:
+ Notebook and Textbook 1B, p.182
pencil, pen, geo, eraser
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#### Slide 5 -Tekstslide

Something new about the Coordinate system(1):

#### Slide 6 -Tekstslide

Something new about the Coordinate system (2):
Schermafbe

#### Slide 7 -Tekstslide

In which quadrant have you been working up to now?
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0:15
A
4
B
3
C
2
D
1

#### Slide 8 -Quizvraag

Watch: the POSITIVE NUMBERS
are used for the 1st Quadrant.
And the 1st Quadrant is the one that
you've used up to now.
But this gonna change soon...

#### Slide 9 -Tekstslide

Now more about Formulas and Graphs:

#### Slide 10 -Tekstslide

Here you see the graph
that belongs to the Formula!

#### Slide 11 -Tekstslide

Making a FORMULA for this graph...
is exactly what you're going to learn now!

#### Slide 12 -Tekstslide

We study the Method together now.
After this you are going to work out these steps yourself!

om 19.56.

#### Slide 14 -Tekstslide

Make a FORMULA for the GRAPH!
How?
+  Open your Textbook on p.184 so you can look
back at the METHOD
+  You're going WORK OUT the 4 STEPS that
we just studied

#### Slide 15 -Tekstslide

Step 1=FOTOVRAAG (next slide)
Step 1:
Make a TABLE
with values you can
(for this graph only 3 values for x and 3 for y)
Take a pic and send it in.

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0:45

#### Slide 16 -Tekstslide

The TABLE (step 1):

Solution Step 1:

#### Slide 18 -Tekstslide

Step 2:
Do this from the Table you made!

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A
6
B
2
C
-6
D
3

#### Slide 19 -Quizvraag

Solution Step 2:

The goes through the Vertical
axis at height -6.
That's why.
The coordinates (0, -6) from the table
also give you this information.

#### Slide 20 -Tekstslide

Step 3:
How much does the graph rise or fall per horizontal step of 1?
timer
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A
2
B
3
C
-6
D
6

Solution step 3:

#### Slide 22 -Tekstslide

Step 4:
The Formula is: ....................
timer
0:30
A
y = 6x - 3
B
3x - 6 = y
C
x = 3y - 6
D
y = - 6 + 3x

#### Slide 23 -Quizvraag

Solution step 4:
the Formula is:
y = 3x - 6                  or:             3x - 6 = y
or  also:                                      -6 + 3x = y

#### Slide 24 -Tekstslide

Looking back ....
- did you do great, or
- did you miss out on these tasks?
- most important is to try hard, so that you learn a lot,
- you probably really begin to understand it when doing your homework!

#### Slide 25 -Tekstslide

Homework:
§ 12.4 Linear formulas: 27, 28 and 29.