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\nWrite the Equation of a Perpendicular Line HS.A-CED.A.2\n

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\nIn this math video lesson, students learn how to write the equation of a line that passes through a given point and is perpendicular to a given line. The visually modeled solution begins with a review of perpendicular lines, emphasizing...\nIn this math video lesson, students learn how to write the equation of a line that passes through a given point and is perpendicular to a given line. The visually modeled solution begins with a review of perpendicular lines, emphasizing that their slopes are negative reciprocals and that the product of the two slopes is –1. We then demonstrate how to start in slope-intercept form y=mx+b by replacing m with the negative reciprocal of the given line’s slope. Next, the video shows how to use the given point (x,y) that the perpendicular line passes through by substituting it into the equation, leaving only one unknown, the y-intercept b. Students watch as we solve for b step by step and finally write the complete equation of the perpendicular line using the slope and y-intercept. This structured, visual approach helps students connect slope relationships to algebraic procedures with clarity and confidence.\n
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Resource Details

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Curator Rating
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Educator Rating
Not yet Rated
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Media Length
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2:14
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Grade
9th - 12th
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Subjects
Math
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Media Type
Instructional Videos
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Source:
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\nThe Magic Of Math\n\n
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Date
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2026
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Language
English
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Audiences
For Teacher Use
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Usage Permissions
Fine Print: Educational Use
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Concepts

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lines, slope
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Additional Tags

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write the equation of a perpendicular line hs.a-ced.a.2, negative 3/4, negative, pair, perpendicular, equation, write, line, passes, point, find, slopes, reciprocal
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Classroom Considerations

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Best For: Explaining a topic
Best For: Reviewing
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