Family of Planes

Q. 2 planes can intersect in which of the following ways

1. Point
2. Line
3. Plane
4. Do not intersect at all

Q. A plane passing through the intersection of 2 planes $\overline{r}.\overline{n_1}=d_1$ and $\overline{r}.\overline{n_2}=d_2$ can be given by
$\overline{r}.(\overline{n_1}+\lambda \overline{n_1})=d_1+\lambda d_2$

1. True
2. False

Q. The equation of a plane passing through $\overline{r}.(\hat{i}+\hat{j}+\hat{k})=1$ and $\overline{r}.(2\hat{i}+\hat{k})=2$ can be given by

1. 
2. 
3. 
4.