lin'ear equa'tion

1. a first-order equation involving two variables: its graph is a straight line in the Cartesian coordinate system.
2. any equation such that the sum of two solutions is a solution, and a constant multiple of a solution is a solution. Cf. linear operator.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

linear differential equationlinear graph
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