F5 Mathz
2007-11-07 6:17 am
Given that the equation of the straight line L: y=mx+4 Find the value of m if L is parallel to the straight line L1: (2m+1)x+y = 0.
回答 (3)
2007-11-07 6:35 am
✔ 最佳答案
L : y = mx+4L1 : y = -(2m+1)x <-- L1 主項變換, 將y 變成主項
∵ L // L1
∴ Slope of L = Slope of L1
m = -(2m+1)
m = -2m - 1
3m = -1
m = -1/3
其實唔難做，
parallel 姐係話 佢地既 斜率一樣
首先一開始將L1條式主項變換
y 做主項, x 前既常數就係slope
之後就只係解方程
有D咩MATHS既PROBLEM都可以ADD我MSN問^_^
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參考: 自己
2007-11-07 6:45 am
L1:y=-(2m+1)x
-(2m+1)=m
3m=-1
m=-1/3
-(2m+1)=m
3m=-1
m=-1/3
2007-11-07 6:24 am
L1:y=-(2m+1)x
-(2m+1)=m
3m=-1
m=-1/3
-(2m+1)=m
3m=-1
m=-1/3
收錄日期: 2021-04-23 19:58:21
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https://hk.answers.yahoo.com/question/index?qid=20071106000051KK04192