Exact Equations & Substitutions · Medium problem

The equation $y' = \dfrac{2x - y + 1}{x + y - 4}$ becomes homogeneous after the shift $x = X + h$, $y = Y + k$, where $(h, k)$ is the point where the lines $2x - y + 1 = 0$ and $x + y - 4 = 0$ meet. Find $h + k$.