For a three variable system of equations to be consistent, the equations formed by the equations must meet two conditions: 1  All three planes have to parallel. 2  Any two of the planes have to be parallel and the third must meet one of the planes at some point and the other at another point.
Osteoarthritis affects 20 million Americans, occurring most often in women and adults older than 45. Osteoarthritis can affect any joint, but it most often occurs in the knees, hips, spine and fingers. At first it may affect only one joint, but if the joint is in the fingers, multiple hand joints may become affected.
The joint lining can get inflamed, but itâs not a major part of osteoarthritis. Symptoms depend on which joint or joints are affected. You may have: 1  Deep, aching pain. 2  Trouble dressing, combing hair, gripping things, sitting, or bending over. 3  Joint is warm to the touch.