As you can see the solution to the system is the coordinates of the point where the two lines intersect. So, when solving linear systems with two variables we are really asking where the two lines will intersect. We will be looking at two methods for solving systems in this section.
Rheumatoid arthritis (RA) is an autoimmune disease in which the bodyâs immune system mistakenly attacks the membranes that line the bodyâs joints. The result is inflammation and pain in the joints.RA is a chronic disease that can cause periods of intense activity called flare-ups.esearchers have established that certain genetic markers may increase your risk of developing RA. The genes in question are related to the immune system in general, to chronic inflammation, or with RA in particular. It is important to note that not everyone with these markers develops RA.
Fast Facts. 1  Rheumatoid arthritis (RA) is the most common type of autoimmune arthritis. 2  It is triggered by a faulty immune system (the bodyâs defense system) and affects the wrist and small joints of the hand, including the knuckles and the middle joints of the fingers.A is the most common form of autoimmune arthritis, affecting more than 1.3 million Americans. Of these, about 75 percent are women. In fact, 1â3 percent of women may get rheumatoid arthritis in their lifetime. The disease most often begins between the fourth and sixth decades of life.