Give a geometric description of the set of points whose coordinates satisfy the given conditions.y2 + z2 = 9, x = -1
A. The circle y2 + z2 = 9 in the plane x = -1
B. All points more than 
units from the origin
C. The cylinder with the radius 
along the x-axis
D. The line tangent to the circle y2 + z2 = 9 at the point x = -1
Answer: A
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