I have two lines, each having starting and end coordinates $(x_1,y_1),(x_2,y_2)$ and $(u_1,v_1),(u_2,v_2)$, with
$(u_1,v_1) = (0,0)$
They are not necessarily intersecting yet, but definitely intersect when one line is extended.
I would like to know how to find their intersection point $(s,t)$ only given their current coordinates.