Answer all questions please. 2. A plane is defined by the equation 2x - 5y = 0. a. What is a normal vector to this plane? b. Explain how you know that this plane passes through the origin c. Write the coordinates of three points on this plane. 3.A plane is defined by the equation x = 0. a. What is a normal vector to this plane? b. Explain how you know that this plane passes through the origin. c. Write the coordinates of three points on this plane