Let S be the graph of x2 +z2 +6z=16 in 3d-space.

(a) The intersection of S with the xz-plane is a circle with center____ and radius_____

(b) The intersection of S with the xy-plane is two lines, x=_____ andx=_____

(c) The intersection of S with the yz-plane is two lines, z =_____ and z =_____

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