Know if an ordered pair is a solution to a system of linear equations in two variables or not. Solve a system of linear equations in two variables by graphing. Solve a system of linear equations in two variables by the substitution method. Solve a system of linear equations in two variables by the elimination method. In this tutorial we will be specifically looking at systems that have two equations and two unknowns. Tutorial 20: Solving Systems of Linear Equations in Three Variables will cover systems that have three equations and three unknowns.
Medical Definition of rheumatic. : of, relating to, characteristic of, or affected with rheumatism rheumatic pain a rheumatic joint.
Key points. 1  Rheumatic heart disease is a condition in which the heart valves have been permanently damaged by rheumatic fever. 2  Rheumatic fever is an inflammatory disease that can affect many connective tissues, especially in the heart. 3  Untreated or under-treated strep infections put a person at increased risk.