Lesson: Equations of Parallel and Perpendicular Lines Mathematics • Third Year of Preparatory School

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In this lesson, we will learn how to write the equation of a line parallel or perpendicular to another line.

Students will be able to

identify whether two given lines are parallel, perpendicular, or neither,
find the equation of a line that is parallel to a given line,
find the values of the unknown coefficients in the equations of two parallel straight lines,
use the relationship between the gradient of perpendicular lines in order to find the slope of a line given a line perpendicular to it,
find the equation of a line that is perpendicular to a given line,
find the values of the unknown coefficients in the equations of two perpendicular straight lines.