Describe and sketch the surface in double-struck R3 represented by the equation y = 2x. The equation represents the set of all points in double-struck R3 whose y-coordinate is ( insert answer) times their x-coordinate, that is, {(x, 2x, z) | x is in double-struck R, z is in double-struck R}. This is a vertical plane that intersects the xy-plane in the line y = , z = .The portion of this plane that lies in the first octant is sketched in the figure.

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