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If an equation or inequality does not make any difference by its existence, it is said to be redundant. For example, if 2x+y=7, 3xy=3 and 5x+y=13, 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 must be>4.5 and the first inequality is automatically satisfied.

Subjects: Mathematics.

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