4 The lines \(l _ { 1 }\) and \(l _ { 2 }\) have equations \(\frac { x - 7 } { 2 } = \frac { y - 1 } { - 1 } = \frac { z - 6 } { 3 }\) and \(\frac { x - 2 } { 1 } = \frac { y - 6 } { 2 } = \frac { z + 2 } { 1 }\) respectively.
- Show that \(l _ { 1 }\) and \(l _ { 2 }\) intersect.
- Find the cartesian equation of the plane that contains \(l _ { 1 }\) and \(l _ { 2 }\).