# 2TTO §1.3 Making linear formulas PTI 21-22

§1.3 Making linear formulas
Goal of this paragraph:
How to make a formula for a line that describes a relation between x and y.
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Slide 1: Tekstslide
WiskundeMiddelbare schoolhavo, vwoLeerjaar 2

In deze les zitten 13 slides, met interactieve quiz en tekstslides.

Lesduur is: 45 min

## Onderdelen in deze les

§1.3 Making linear formulas
Goal of this paragraph:
How to make a formula for a line that describes a relation between x and y.

#### Slide 1 -Tekstslide

1st           a freshen up:
The formula for a straight line is called a LINEAR FORMULA.
The graph for the formula s = 15 - 3a is a straight line.
This is taken from §1.1 Linear relations.
Next slide shows you the graph too!

video

#### Slide 5 -Tekstslide

2nd:         we make an example of a linear formula:
-  Suppose we, as a class and a teacher, go on a rowing trip on the
Ijsselmeer.
-  The fixed amount (the money we have to pay, no matter how many boats are hired) is 15 euros.
-  The number of boats we hire, we call b. (DON'T USE CAPITALS!!)
-  Every boat costs 5 euros.
-  The total cost for the trip we call c.
-  In the next slide CHOOSE the RIGHT FORMULA for this trip.

#### Slide 6 -Tekstslide

The right formula is:

- The fixed amount (the money we have to pay, no matter how many boats are hired) is 15 euros.
- The number of boats we hire, we call b. (DON'T USE CAPITALS!!)
- Every boat costs 5 euros.
- The total cost for the trip we call c.
A
c = 15b + 5
B
15 + 5b = c
C
c = 15 + 5b
D
b = 15c + 5

#### Slide 7 -Quizvraag

B        15 + 5b = c    or
C         c = 15 + 5b

he fixed amount (the money we have to pay, no matter how many boats are hired) is 15 euros.- The number of boats we hire we call b.
- Every boat costs 5 euros. - The total cost for the trip we call c.

#### Slide 8 -Tekstslide

3rd:   Now we have a graph given of a straight line.
How to make a linear formula?   Next slide shows you how!
> make table
> choose starting value
> use general formula...
y = ax + b

#### Slide 9 -Tekstslide

The next slide shows you

The next slide describes which steps were taken.

#### Slide 10 -Tekstslide

This is what has been done:
15.06.28

Homework:

Evaluation