21.2 The Straight Line

  • Point-slope Form of Equation • Vertical Line • Horizontal Line • Slope-intercept Form of Equation • General Form of Equation

In Chapter 5, we derived the slope-intercept form of the equation of the straight line. Here, we extend the development to include other forms of the equation of a straight line. Also, other methods of finding and applying these equations are shown. For completeness, we review some of the material in Chapter 5.

Using the definition of slope, we can derive the general type of equation that represents a straight line. This is another basic method of analytic geometry. That is, equations of a particular form can be shown to represent a particular type of curve. When we recognize the form of the equation, ...

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