幫我解解e條用消元法做既方程
回答 (2)
✔ 最佳答案
2x+7y-14=0 -1
3x+y=2 -2
由2,
7(3x+y)=2(7)
21x+7y=14
21x+7y-14=0 -3
1-3,
2X+7Y-14=0
-)21x+7y-14=0
-------------
-19X=0
X=0
代x=0入2,
3(0)+y=2
y=2
參考: meme
Let :
2x+7y-14=0 .....(1)
3x+y=2 ....(2)
3*(1) - 2*(2)
=> 6x + 21y - 42 =0
- 6x + 2y = 4
_________________
19y -42 = -4
=> y = 2
Substitute y = 2 into (2)
3x + 2 = 2
=> x = 0
Therefore, x = 0 & y = 2 (Answer)
收錄日期: 2021-04-23 21:07:05
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