x-3y+1=0
则 y=(1/3)x+1/3
∴ 直线的斜率是1/3
∴ tana=1/3
∴ tan2a=2tana/(1-tan²a)=2*(1/3)/[1-(1/3)²]=(2/3)/(8/9)=3/4
∴ 直线L的方程是 y-1=(3/4)(x-2)
化简得 3x-4y-2=0