Choosing the Form for Writing an Equation of a Line
The most efficient way to write the equation of a line depends on what information is given:
- Given the slope and the y-intercept, use the slope-intercept form directly: .
- Given the slope and any point on the line, use the point-slope form: .
- Given two points on the line, first calculate the slope from the two points, then use the point-slope form: .
In every case where the point-slope form is used, the result can be simplified into slope-intercept form afterward. Matching the form to the available information avoids unnecessary steps and makes equation-writing faster.
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