can anyone help me in getting the solutions to the below problem with explanations?
1. If the straight lines x=1+s,y=-3-λs,z=1+λs and x=t/2,y=1+t,z=2-t with parameters s and t respectively, are co-planar then λ equals ?
2. The median is a set of 9 distinct observations is 20.5. if each of the largest observations of the sets is increased by 2, then the median of the new set?