The distance from m to the known straight line is (/- 1-5/)/ root number 10.
The distance from m to the straight line is (/- 1-5/)/ root number 10.
So (/- 1+b/)/ number of radicals 10=(/- 1-5/)/ number of radicals 10.
So b=7.
So his equation is x+3y+7=0.
The other two are perpendicular to the known straight line, so the equations are 3x-y+k=0 respectively.
The distance from m to them is (/-3+k/) root number 10=(/- 1-5/)/ root number 10.
So k=-3 or 9.
So their equations are 3x-y+9=0, 3x-y-3=0.