中二數學圖解法方程組

x+3y=5
x| -2 | -1 | 0 | 1 | 2
y| 7/3| 2 | 5/3| 4/3 | 1

6x+16y=27

x| -2 | -1 | 0 | 1 | 2
y| 39/16 | 33/16 | 27/16 | 21/16 | 15/16


2010-09-02 20:05:47 補充：
x + 3y = 5
when x = -2,
-2 + 3y = 5
3y = 7
y = 7/3
when x = -1,
-1 + 3y = 5
3y = 6
y = 2
when x = 0,
0 + 3y = 5
y = 5/3
when x = 1,
1 + 3y = 5
3y = 4
y = 4/3
when x = 2,
2 + 3y = 5
3y = 3
y = 1

2010-09-02 20:07:08 補充：
6x+16y=27
when x = -2.
-12 + 16y = 27
16y = 39
y = 39/16
when x = -1,
-6 + 16y = 27
16y = 33
y = 33/16
when x = 0,
16y = 27
y = 27/16
when x = 1,
6 + 16y = 27
16y = 21
y = 21/16
when x = 2,
12 + 16y = 27
16y = 15
y = 15/16

2010-09-02 20:26:02 補充：
http://www.sendspace.com/file/nsufw3
圖已upload

To 001,
Can you solve the equation by graphical method?I can not draw a straight line.