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Projecting 3D coordinates to 2D for text drawing

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I'm trying to draw text on screen using ID3DXFont but this only takes 2D coordinates. So far I've got:
	D3DXMATRIX n = viewmatrix * projectionmatrix;

	D3DXMATRIX textposition3d;
	D3DXMatrixTranslation(&textposition3d, 6.0f, 0.0f, 0.0f);

	D3DXMATRIX textposition2d = textposition3d * n;

	r->rendertext(L"text on screen", <x coordinate>, <y coordinate>);
I'm not sure whether this is the correct way to go about it and I also have no idea how to extract the coordinates from the textposition2d matrix. Any help would be appreciated :)

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