The circle in 3D space of radius 6 centered at point (2, -3, 8) and lying in a plane perpendicular to the x-axis.

What is the equation to describe the set of points?

I know that the equation of circle is (x-2)^2 + (y+3)^2 + (z-8)^2 = 36 but how to account for perpendicular to x-axis?