Electrical transmission wires which are laid down in winters are stretched tightly to accommodate expansion in summers. Two such wires lie along the following lines : $l_1 : \frac{x+1}{3} = \frac{y-3}{-2} = \frac{z+2}{-1}$ $l_2 : \frac{x}{-1} = \frac{y-7}{3} = \frac{z+7}{-2}$ Based on the given information, answer the following questions : (i) Are the lines $l_1$ and $l_2$ coplanar ? Justify your answer. (ii) Find the point of intersection of the lines $l_1$ and $l_2$.