<P> This article considers the case of a single equation for which one searches the real solutions . All its content applies for complex solutions and, more generally for linear equations with coefficients and solutions in any field . </P> <P> A linear equation in one unknown x may always be rewritten </P> <Dl> <Dd> a x = b . (\ displaystyle ax = b .) </Dd> </Dl> <Dd> a x = b . (\ displaystyle ax = b .) </Dd>

What is the difference between linear function and linear equation