For no solution, the two lines have to never intersect, which means they have to be parallel lines. In other words, no solution will satisfy both equation. For infinitely many solutions, the two lines have to overlap each other, which means one equation has to be a multiple of the other equations.
[joint] the site of the junction or union of two or more bones of the body; its primary function is to provide motion and flexibility to the frame of the body. Some are immovable, such as the sutures where segments of bone are fused together in the skull.
The AP axial projection (Grashey method) of the skull. The frontal and facial bones are projected down and away from superimposition on the occipital bone. If positioning is accurate, the dorsum sella and posterior clinoid processes will be demonstrated within the foramen magnum.he frontal and facial bones are projected down and away from superimposition on the occipital bone. If positioning is accurate, the dorsum sella and posterior clinoid processes will be demonstrated within the foramen magnum.