Zainuri, AryanSyamsudhuhaSirait, Asli2016-02-042016-02-042016-02-04wahyu sari yenihttp://repository.unri.ac.id/xmlui/handle/123456789/7899This article discusses the necessary and sufficient condition for the system of linear equations Ax = b where A is an m × n matrix, with m < n and b is an n × 1 vector to have a solution. The discussion involves determining the number of single variables by looking at columns lowering rank and determining the value of the single variables.ennonhomogeneous system of linear equationconsistency theorema nec- essary conditionsufficient conditionsmatrixstudent Paper Post Degree