# 2TTO Ch 1 Linear formulas PTI '22-'23

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Mathematics
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Slide 1: Slide
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This lesson contains 51 slides, with interactive quizzes and text slides. Lesson duration is: 45 min

## Items in this lesson

Welcome back!!
to

Mathematics

#### Slide 1 -Slide

What to bring
You probably still remember ?!

#### Slide 2 -Slide

Ch 1 Linear formulas

Recap:

#### Slide 5 -Slide

s = 15 - 3a
Is this a linear formula? How do you know?

#### Slide 6 -Open question

s = 15 - 3a
The starting value is
A
15
B
-3a
C
s
D
3a

#### Slide 7 -Quiz

consecutive means
A
afnemend
B
stijgend
C
consequent
D
opeenvolgend

#### Slide 8 -Quiz

Formula:
d = -2c +10.
The corresponding graph is
A
rising
B
falling
C
horizontal
D
vertical

#### Slide 9 -Quiz

When the gradient in a linear formula is positive (f.e. y = 4x -5), the corresponding graph is:

draw with pencil

#### Slide 11 -Slide

Ch 1.3 Making Linear formulas

#### Slide 12 -Slide

Which graph is of a

real linear formula?

#### Slide 13 -Slide

recap
Questions homework?

#### Slide 15 -Slide

Formula: y = 3x -5

The y-intercept is:
A
3
B
3x
C
5
D
-5

k = 15x + 34

A
15
B
15x
C
34
D
there is none

#### Slide 17 -Quiz

The general form of a linear formula is:

#### Slide 18 -Open question

Homework:
Make: 1.3: 21, 22, 23 and
choose OR S21, or C4 or C5.

timer
8:00

#### Slide 22 -Slide

Evaluation
Do you know:
> how to find the y-intercept?

> how to calculate the gradient (slope/(helling))?

> the general form of the formula for a straight line?

#### Slide 23 -Slide

1.4 Directly proportional

1 pair of socks costs 2 euros
2 pairs cost.....
0 pair ??

#### Slide 24 -Slide

Questions regarding HW?

#### Slide 25 -Slide

Directly proportional
= recht evenredig

Theory

#### Slide 28 -Slide

Directly proportional when:

(note in notebook)
a straight line that passes through
the ORIGIN (0,0)
> it has to be a RATIO TABLE

Time to work
timer
8:00

#### Slide 30 -Slide

1.4 directly proportional

#### Slide 31 -Slide

Directly proportional when:

(note in notebook)
a straight line that passes through
the ORIGIN (0,0)
> it has to be a RATIO TABLE

#### Slide 32 -Slide

Is this formula directly proportional?
why (not)?

#### Slide 33 -Slide

Is this formula directly proportional?
why (not)?

#### Slide 34 -Slide

Is this formula directly proportional?
why (not)?

HW:

Time to work:
timer
10:00

#### Slide 37 -Slide

Extra explanation?

Evaluation

#### Slide 39 -Slide

1.5 Line through TWO points

#### Slide 41 -Slide

How to find the formula?
Step 1) Write down the regular form of the formula:
y= a x + b
Step 2) Make a quick drawing of the two points.
4) Fill in x and y in the formula and calculate b (= y-intercept)
Step 5) Write down the final formula

#### Slide 42 -Slide

1.5 Line through TWO points (part 2)

#### Slide 43 -Slide

How to find the formula?
Step 1) Write down the regular form of the formula:
y= a x + b
Step 2) Make a quick drawing of the two points.
Step 4) Fill in x and y in the formula and calculate b (= y-inercept)
Step 5) Write down the final formula

Recap

#### Slide 50 -Slide

Parallel lines have the same GRADIENT!!