Question

what is simple linear equation? why it is called linear?

Answer 1

A simple example of a linear equationwith only one variable, x , may be written in the form: ax + b = 0, where a and b are constants and a ≠ 0. ... Anequation is linear if the sum of the exponents of the variables
of each term is one.
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Answer 2

a linear equation is a algebraic equation in which each term is either a constant or the product of a constant and ( the first power of) a single variable ( however, different variable may occur indifferent terms)