Two lines in 3D Cartesian space

Geometry Level 2

If the two lines \[\begin{align} \frac {x-1 }{k } &=\frac { y+1 }{2 } =z,\\ \\ \\ \frac {x+2 }{-3 } & =1-y =\frac{z+2}{k} \end{align}\] are perpendicular to each other, then what is the value of \(k?\)

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