Describe in Words the Intersection of the Surfaces $z = \sqrt { x ^ { 2 } + y ^ { 2 } }$

Essay

Describe in words the intersection of the surfaces $z = \sqrt { x ^ { 2 } + y ^ { 2 } }$ and $z = 7 - 6 \left( x ^ { 2 } + y ^ { 2 } \right)$