已知直线l的倾斜角为135,且经过点P(1,1). (Ⅰ)求直线l的方程;

已知直线l的倾斜角为135,且经过点P(1,1)

(Ⅰ)求直线l的方程;

(Ⅱ)求点A(3,4)关于直线l的对称点A的坐标.

答案

解:(Ⅰ)∵ktan135=-1,……………………………………………2

ly1=-(x1),即xy20;………………………………5

(Ⅱ)设A(a, b),则…………………8

      解得a=-2b=-1,∴A(2,1).……………………………10

     

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