1718 WB1Y CH3 Lesson 2

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 1

Which homework exercises should I discuss on the board?

More on coordinates

Point (0,0) is called the origin.
It is often indicated with the
letter O.
It is the point of intersection
between the horizontal and
vertical axis.

More on coordinates

If an axis does not start at zero,
you should use a zigzag.

(the book often forgets to do this!)

More on coordinates

Points (0,8), (1,6) and (4,0) are
called grid points, because they
lie on the vertices of the grids
of the paper.
Points (5.5, 2), (5.5, 3) and (6, 5)
are NOT grid points, because they
do NOT lie on the vertices of the grids

Reading graphs

Graphs show a relation between two
variables. In this graph there is a
relation between the time and the
temperature. The variables are given
at the horizontal and vertical axes.

The graph can rise, stay constant, or fall.

The variables are given on the axes. Each variable is given in a certain unit.

Variables can be given in a certain unit. If you change the unit, the graph stays the same, only the axes change.
For example, the variable time can be given in the unit hours or minutes or days or years, etc.

Is point (13, 55) in the graph of exercise 4 a grid point?

1. Yes
2. No

What is the VARIABLE given on the vertical axis at exercise 1?

1. height
2. cm
3. time
4. hours

What is the UNIT used on the horizontal axis in exercise 4?

1. humidity
2. %
3. time
4. days

Homework Tuesday

Make and correct: 7, 8, 10, 11, 12, 14 and 16 from §3.2 and §3.3