If common chord of circle $x^2 + y^2 + 5kx + 2y + k = 0$ and $x^2 + y^2 + kx + \dfrac{y}{2}+ \dfrac{1}{2} = 0$ is $4x - 5y - k = 0$ then number of values of $k$ is
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If common chord of circle $x^2 + y^2 + 5kx + 2y + k = 0$ and $x^2 + y^2 + kx + \dfrac{y}{2}+ \dfrac{1}{2} = 0$ is $4x - 5y - k = 0$ then number of values of $k$ is