Graphs of Linear Equations. Please download the powerpoint file to enable animations Disclaimer: Some parts of the presentation are obtained from various sources. Credit to the rightful owners.

1. Graphs of Linear
Equations

2. The relationship between the number of passengers and the bus fare
Number of Passengers
Bus fare (baht)
0
0
1
7
2
14
3
21
4
28
Ordered pairs:
0,0 1,7 2,14 3,21 4,28
In writing ordered pairs representing relations between two sets of
data, we must clearly define which data set is represented by the
first or the second entry. The order of the entries in ordered pairs
cannot be changed without changing the meaning of the pairs.

3. The relationship between the number of passengers and the bus fare
Number of
Passengers
Bus fare (baht)
0 1
7
14
21
28
35
2 3 4 5

4. The relationship between the number of notebooks and the prices
Number of notebooks
Price (baht)
0
0
1
8
2
16
3
24
4
32
Ordered pairs:
0,0 1,8 2,16 3,24 4,32

5. Number of
notebooks
Price (baht)
0 1
8
16
24
32
40
2 3 4 5
The relationship between the number of notebooks and the prices

6. Daily Allowance of Rujarek
Day
Allowance (baht)
1
80
2
80
3
80
4
80
5
80
Ordered pairs:
1,80 2,80 3,80 4,80 5,80

7. Day
Allowance (baht)
0 1
40
80
2 3 4 5
The relationship between the number of notebooks and the prices

8. The right triangle ABC where ABC = 90° as shown in the figure below:
BAC (degrees)
ACB (degrees)
10 3
80
4
80
5
80
Ordered pairs:
10,80 20,70 30,60 40,50 50,40
A B
C
80
20
70
30
60
40
50
50
40
60
30
70
20
80
10
60,30
70,20 80,10

9. BAC (degrees)
(degrees)
0 10
10
20 30 40 50
The relationship between BAC and ACB
60 70 80 90
20
30
40
50
60
70
80
90

10. When the two sets of number are integers, the
graphs representing their relationship are
points aligned in straight lines
When the two assigned quantities change
continuously, the graphs showing their
relationship becomes a straight line

11. Number of
notebooks
Price (baht)
0 1
8
16
24
32
40
2 3 4 5
The relationship between the number of notebooks and the prices