# 2TTO 1-1 Gradient and y-intercept

2TTO
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Slide 1: Tekstslide
WiskundeMiddelbare schoolvwoLeerjaar 1

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

Lesduur is: 50 min

## Onderdelen in deze les

2TTO

#### Slide 1 -Tekstslide

Refresh assignment
See work sheet
- Check (2 min)

#### Slide 2 -Tekstslide

Don't forget...
Draw with pencil + ruler
(table + graph)
Axes max 10 cm long
Choose appropriate scale
(fixed step size!)
Mention variables along axes

#### Slide 3 -Tekstslide

Linear relations
If there is a linear relation between two variables, you can make a linear formula. All linear formulas have the form

is the variable on the vertical axis
is the variable on the horizontal axis
is the y-intercept
y=ax+b
y
x
a
b

#### Slide 4 -Tekstslide

What is the GRADIENT in the formula
y = 3x - 4?
A
y
B
3
C
x
D
-4

#### Slide 5 -Quizvraag

What is the Y-INTERCEPT in the formula b = 2t + 8?
A
b
B
2
C
t
D
8

#### Slide 6 -Quizvraag

What is the GRADIENT in the formula
t = 25 - 1.5h

A
25
B
-25
C
1.5
D
-1.5

#### Slide 7 -Quizvraag

Linear relation in a table
If there is a linear relation between two variables, you can see this in a table. In that case there is a fixed increase in the top AND bottom row of the table.

#### Slide 8 -Tekstslide

Gradient = the fixed increase per step of 1 for the horizontal variable (variable in top row).    So gradient =

steps of 1 in top row                          steps of 2 in top row

#### Slide 9 -Tekstslide

Y-intercept in a table
The y-intercept is the value in the bottom row when the value in the top row is 0. It is the value where the graph intersects the vertical axis

under 0 is 8                                 0 is not in the top row, 1 - 1 = 0 and 7 - 2.5 = 4.5
y-intercept = 8                           y-intercept = 4.5

#### Slide 10 -Tekstslide

Get to work
Work on ex 4 / 5 / 6 .
Work together, discuss questions + answers.
Check your work carefully,  correct if needed.

#### Slide 11 -Tekstslide

Homework
(Monday 27 August)

Study answer model refresh assignment (if necessary)
Do ex 4/5/6/7 of par 1-1