In each case, determine whether or not the lines have a single point of intersection. If they do, give an equation of a plane containing them. a)r1 = (St,2t1,2t2)andr2 = (t6,t+5,t8) b)r1 = (4t,3t+ 1,t4) 311er = (2t3,t,t 1) (Express numbers in exact form. Use symbolic notation and fractions where needed. Enter DNE if lines do not intersect.) (a) the equation of the plane: (b) the equation of the plane