If the linear system   ( x + 2 y + 4 z = 3 3 x +…

If the linear system   ( x + 2 y + 4 z = 3 3 x + 5 y + 2 = 4 − x − y + k z = 2 {“version”:”1.1″,”math”:” \left( \begin{array}{lll} x + 2y + 4z & = & 3 \\ 3x + 5y + 2 & = & 4 \\ -x – y + kz & = & 2 \\ \end{array} \right.”}has infinitely many solutions,  then which number  is the value of  k {“version”:”1.1″,”math”:”\(\, k\)”}?