Any variable in a linear equation is to the first power.
The exponent is normally not written.
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Equations can be classified according to the highest power of the variable. Since the highest power of the variable in a linear equation is one, it is also called a first-order equation.
Resembling, represented by, or consisting of a line or lines. Examples in maths: linear equation: A linear equation is an algebraic equation in which each term is either a constant or the product of a constant and (the first power of) a single variable. Typical linear equation:
The word linear means in a straight line. If the graph is a line, it is linear. Also, linear equations are of the first order; they contain a variable but not a square (or higher power) of a variable. If the equation contains x2 it is not linear.
Neither variable appears anywhere in the equation in a denominator, or raised to any power except the first power.