intersecting planes

Level pending

For what value of \(k\) do the following sets of planes intersect in a line?

\(3x-y+z=0\)

\(kx+2y-z=0\)

\(4x+y+z=0\)

The answer can be represented as \(-\frac { a }{ b } \). Express the answer as \(a+b\).

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