已知直线L经过点P(-3,6),它的倾斜角是直线X-Y +2=0的倾斜角的3倍,求这条直线的方程
人气:130 ℃ 时间:2020-05-22 23:51:35
解答
直线X-Y +2=0的倾斜角 45°
所以角度为135° 斜率为-1;
y-6=-(x+3)
y=-(x+3)+6=-x+3倾斜角怎么求的?倾斜角怎么求的?tan倾斜角=斜率直线X-Y +2=0斜率=1,所以倾斜角=45°或225°舍去(倾斜角大于等于0小于等于180°)
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