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2014-12-16T17:41:13+08:00
A linear equation is sometimes used to mean a first-degree polynomial function of one variable. 
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2014-12-19T01:06:33+08:00

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They are equations whose polynomial have their leading term with the degree 1. So  x^2 = x +3 is not a linear equation because the leading term x ^2 has the degree 2 and not 1. They are often useful in solving age problems and the like.
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