Hi

My question is

Distance $\displaystyle \ell$of the point $\displaystyle \overrightarrow{P}$from the line $\displaystyle \overrightarrow{r}=\overrightarrow{r_{0}}+t\overri ghtarrow{v}$ can be calculated as $\displaystyle \ell=\frac{\left|(\overrightarrow{P}-\overrightarrow{r_{0}})\times\overrightarrow{v}\ri ght|}{\left|\overrightarrow{v}\right|}$

Find how far is the point (4,1,1) from the line where the two planes $\displaystyle x+2y=4$and $\displaystyle y=0$intersect.