Find the vector and Cartesian forms of the equations of the plane containing the two lines

Find the vector and Cartesian forms of the equations of the plane containing the two lines $\bar{r}=(\hat{i}+2 \hat{j}-4 \hat{k})+\lambda(2 \hat{i}+3 \hat{j}+6 \hat{k})$ and $\bar{r}=(9 \hat{i}+5 \hat{j}-\hat{k})+\mu(-2 \hat{i}+3 \hat{j}+8 \hat{k}) \ldots$