The planes [latex]{{\text{p}}_{1}}[/latex] and [latex]{{\text{p}}_{2}}[/latex] have equations [latex]\mathbf{r}\cdot \left( \begin{matrix}1 \\ -3 \\ 2 \\\end{matrix} \right)=-5[/latex] and [latex]\mathbf{r}\cdot \left( \begin{matrix} 2 \\-1 \\ 3 \\\end{matrix} \right)=1[/latex] respectively, and meet in the line [latex]{{l}_{4}}[/latex]. Find
(i)
the vector equation for [latex]{{l}_{4}}[/latex],
(ii)
Find the acute angle between [latex]{{\text{p}}_{1}}[/latex] and [latex]{{\text{p}}_{2}}[/latex].