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**From Wolfram MathWorld:**

A linear equation is an algebraic equation of the form $$y = mx + b$$ involving only a constant and a first-order (linear) term, where m is the slope and b is the y-intercept.

Occasionally, the above is called a "linear equation of two variables," where y and x are the variables.

Linear -- from Wolfram MathWorld

**Horizontal Line:** $$y = 3 \space ( or \space\space any\space\space number )$$ Lines that are horizontal have a slope of zero. They have "run", but no "rise". The rise/run formula for slope always yields zero since rise = 0.

**Vertical Line:** $$x = -2 \space ( or \space\space any\space\space number )$$ Lines that are vertical have no slope (it does not exist). They have "rise", but no "run". The rise/run formula for slope always has a zero denominator and is undefined.

$$y = 3x – 6$$ $$y - 2 = 3(x + 1)$$ $$y + 2x - 2 = 0$$ $$5x = 6$$ $$\frac{y}{2} = 3$$$$y = 2x+1$$

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