Find the vector form as well as in Cartesian form, the equation of the line passing through the points `A(1,\ 2,-1)a n d\ B(2,\ 1,\ 1)dot`

Explanation

vector equation:


`vec{r}=(hat{i}+2 hat{j}-hat{k})+lambda(hat{i}-hat{j}+2 hat{k})`



cartesian equation:



`frac{x-1}{1}=frac{y-2}{-1}=frac{z+1}{2} .`