Hi, I am not sure of the best strategy to approach finding the parametric description of an intersection line in 3-D where the two planes are also described parametrically.

The planes are described {t - u, 3t + u, u} and {4r - s, 0, s + r}

I know how to do this if the equations of the planes are Cartesian. Should I somehow convert them and eliminate the parameters?

Thanks!