3. Determine if theline =5 =73 =3 and 21 =73 T T3 are perpendicular. Explain your answer. [5 marks] 4. If a plane has the normal # = (2: 0, 1) and a line has direction vector d = (1 3:'@, show that the line is either on the plane or parallel to it. [3 marks] 5. Determine values for for which the following system has one solution, no solutions, and an infinite number of solutions. [3 marks] 2k + 4y = 20 3x+ 6y = 30