A system of linear equations is two or more linear equations that are solved together and have a common solution. In order to show that they belong to the same system of equations, the equations are grouped together with a large curly bracket and sometimes roman numerals in order to more easily refer to them. Equation systems often contain more than one unknown variable and the solution for the system will be those values that make all the equations correct. In the example above, a pair of - and -values were asked for, and when that specific values is used, the right hand and left hand sides are equal in both equal. The solution in this case was and which is usually written as Systems of equations can be solved using an algebraic method like elimination- or substitution.