If the line \( y = 4 + kx, \; k > 0 \), is the tangent to the parabola \( y = x - x^2 \) at the point \( P \) and \( V \) is the vertex of the parabola, then the slope of the line through \( P \) and \( V \) is:
\( \frac{3}{2} \)
\( \frac{26}{9} \)
\( \frac{5}{2} \)
\( \frac{23}{6} \)
