**Linear Equations - Definition, Formula, Graph, Examples - Cuemath**
https://www.cuemath.com/algebra/linear-equations/

WebA linear equation in two variables is of the form Ax + By + C = 0, in which A, B, C are real numbers and x and y are the two variables, each with a degree of 1. If we consider two such linear equations, they are called simultaneous linear equations. For example, 6x + 2y + 9 = 0 is a linear equation in two variables.

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