8. (a) Show that relative to the xyz-coordinate system in R3, the nullspace of A is all the points on the z-axis and the the column space is all points in the xy-plane. 1 0 A = 1 0 0 0 0 (b) Find a matrix whose null space is the x-axis, and whose column space is the yz-plane. (c) Find a matrix whose null space is the y-axis, and whose column space is the xz-plane.