with(linalg): v := vector(3); u := vector(3); Line := { u + t*v}; L := t -> u + t*v; L(0); L(1); evalm(L(t)); with(plots); ! wlot(`lines-planes-maple1.gif`,spacecurve,[2+t, 1-2*t, -1+3*t], t=-4..4, axes=NORMAL, color=RED);