Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
Related to linear equation: quadratic equation
An algebraic equation, such as y = 2x + 7 or 3x + 2y - z = 4, in which the highest degree term in the variable or variables is of the first degree. The graph of such an equation is a straight line if there are two variables.
(Mathematics) a polynomial equation of the first degree, such as x + y = 7
a first-order equation involving two variables: its graph is a straight line in the Cartesian coordinate system.