Find the distance from the point (- 6, - 3,1) to the a. xy-plane b. yzplane c. xz-plane. {E a. The distance from the point to the xy-plane is E. (Type an exact answer, using radicals as needed.) b. The distance from the point to the yzplane is El. (Type an exact answer, using radicals as needed.) c. The distance from the point to the xz-plane is E. (Type an exact answer, using radicals as needed.)