If an equation (or inequality) does not affect the solution set of other equations (or inequalities), it is said to be redundant. For example, if
any one of these equations can be termed redundant because the other two are sufficient to identify x = 2, y = 3 as the only solution. If 3x+2y > 4 and 6x+4y > 9 then the first inequality is redundant because if 6x+4y>9 it follows that 3x+2y >4.5 and the first inequality is automatically satisfied. If one or more simultaneous linear equations are redundant, then in echelon form there will be a zero row.