Slope-intercept form

In mathematics, a linear equation is an equation that may be put in the form

where ${\displaystyle x_{1},\ldots ,x_{n}}$ are the variables or unknowns, and ${\displaystyle c,a_{1},\ldots ,a_{n}}$ are coefficients, which are often real numbers, but may be parameters, or even any expression that does not contain the unknowns. In other words, a linear equation is obtained by equating to zero a linear polynomial.

The solutions of such an equation are the values that, when substituted to the unknowns, make the equality true.

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