Find the solution to the following set of equations :
2x - 5y = 2............(1)
3x + y = 28 .............(2) and
- x + 3y = 1 ..........(3)
Please show steps.
System of equations
2012-08-09 7:27 am
回答 (1)
2012-08-09 7:54 am
✔ 最佳答案
2x - 5y = 2 ...... (1)3x + y = 28 ...... (2)
-x + 3y = 1 ...... (3)
只用 (1) 和 (3) 解方程式組：
(3) * 2 :
-2x + 6y = 2 ...... (3')
(1) + (3') :
y = 4
把 y = 4 代入 (1) :
2x - 5(4) = 2
2x = 22
x = 11
把 x = 11 及 y = 4 代入 (2) 中：
左式 = 3(11) + 4 = 37 ≠ 右式
故此題無解。
參考: andrew
收錄日期: 2021-04-13 18:54:31
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120808000051KK01067