System of Linear Equations
The number of equations should be at least the number of unknowns in order to solve the variables. System of linear equations can be solved by several methods, the most common are the following,
1. Method of substitution
2. Elimination method
3. Cramer's rule
Many of the scientific calculators allowed in board examinations and class room exams are capable of solving system of linear equations of up to three unknowns.