Mathematics - 3D-Coordinate Geometry Question with Solution | TestHub

The equation of the straight line in the plane $\vec{r}\cdot \vec{n}=d$ which is parallel to $\vec{r}=\vec{a}+\lambda \vec{b}$ and passes through the foot of the perpendicular drawn from the point $P(\vec{a})$ to the plane $\vec{r}\cdot \vec{n}=d$ (where $\vec{n}\cdot \vec{b}=0$ ) is