8y=x+20-----------------(1)
x+8y-4=0----------------(2)
Simultaneous Linear Equations
2011-03-04 11:00 pm
回答 (2)
2011-03-04 11:18 pm
✔ 最佳答案
from (1),-x + 8y = 20 .....(3)
from (2),
x + 8y = 4 .....(4)
(3) - (4),
-2x = 16
x = -8
-8 + 8y = 4
y = 1.5
參考: ME
2011-03-04 11:18 pm
8y = x + 20-----------------(1)
x + 8y - 4 = 0----------------(2)
From (2): 8y = 4 - x
Sub. into (1) 4 - x = x + 20
2x = -16
x = -8
So, 8y = 4 - (-8) = 12, y = 12/8 = 3/2
x + 8y - 4 = 0----------------(2)
From (2): 8y = 4 - x
Sub. into (1) 4 - x = x + 20
2x = -16
x = -8
So, 8y = 4 - (-8) = 12, y = 12/8 = 3/2
收錄日期: 2021-04-15 17:31:25
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110304000051KK00462