a. x=3+t,y=1,z=5,t∈Rx=3+t,y=1,z=5, t\isin\Realsx=3+t,y=1,z=5,t∈R b. y=1,z=5y=1,z=5y=1,z=5 c. La línea no intersecta al plano xyxyxy