求過(-1,1)且平行於5x+4y=0的直線的方程.
點求斜率呀,只要知道斜率就即刻計到.
關於直線與直線圖形的一條問題.
2007-06-26 4:31 am
回答 (2)
2007-06-26 4:37 am
✔ 最佳答案
5x+4y=04y= -5x
y=(-5/4)x
所以斜率=(-5/4)
(y-1) / (x+1) =(-5/4)
4y-4 = -5x-5
5x +4y+1 = 0
2007-06-26 4:37 am
slope of
ax + by + c = 0
is -a/b
ax + by + c = 0
is -a/b
收錄日期: 2021-04-12 21:45:38
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070625000051KK04132