The line through the points the points  xo,yo,zo{“version”:”…

The line through the points the points  xo,yo,zo{“version”:”1.1″,”math”:”xo,yo,zo”}  and x1,y1,z1{“version”:”1.1″,”math”:”x1,y1,z1″}  can be parametrized by the function r⇀=r⇀o+t v⇀{“version”:”1.1″,”math”:”r⇀=r⇀o+t v⇀”}. What do the vectors  r⇀o{“version”:”1.1″,”math”:”r⇀o”}  and  v⇀{“version”:”1.1″,”math”:”v⇀”}  represent?