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.
Note the pterion, a weak point of the skull, where the anterior middle meningeal artery is at risk of damage. There are certain areas of the skull that are natural points of weakness: 1  The pterion: a âH-shapedâ junction between temporal, parietal, frontal and sphenoid bones.t encloses and protects the brain, meninges and cerebral vasculature. Anatomically, the cranium can be subdivided into a roof (known as the calvarium), and a base: 1  Calvarium: Comprised of the frontal, occipital and two parietal bones.