Question

The equation of line L is y=3x–4 and is perpendicular to line H. They cross each other at the y-intercept of line L. Find the equation of line H.

Answer 1

Grad of L =3
Grad of H =−¹/₃                       
Co-ord of intersection (0,−4)
 y−−4 =−¹/₃
    x
3(y=4)=−x                           
3y+12=−x
      3y=−x−12