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.
Symptoms of osteoarthritis vary, depending on which joints are affected and how severely they are affected. However, the most common symptoms are pain and stiffness, particularly first thing in the morning or after resting. Affected joints may get swollen, especially after extended activity.ymptoms of osteoarthritis vary, depending on which joints are affected and how severely they are affected. However, the most common symptoms are pain and stiffness, particularly first thing in the morning or after resting. Affected joints may get swollen, especially after extended activity.