The method of solving by substitution works by solving one of the equations (you choose which one) for one of the variables (you choose which one), and then plugging this back into the other equation, substituting for the chosen variable and solving for the other. Then you back-solve for the first variable.
Rheumatoid arthritis, an inflammation of the joints, is a disabling disease that can affect the appearance and the function of the hands and other parts of the body.It often deforms finger joints and forces the fingers into a bent position that hampers movement.The exact cause of rheumatoid arthritis is not known.heumatoid arthritis, an inflammation of the joints, is a disabling disease that can affect the appearance and the function of the hands and other parts of the body.
Rheumatoid Arthritis Symptoms. Along with joint inflammation and pain, many people experience fatigue, loss of appetite and a low-grade fever. Because RA is a systemic disease, it may also affect organs and body systems.