The Straight Line
The following examples and case studies demonstrate how to apply the various formulas and concepts related to straight lines, including standard forms, families of lines, and calculating distances and angles.
Standard Forms of Equations
Example
Problem 1 (Point-Slope Form): Find the equation of the line passing through the point with a slope of . Write the final equation in standard general form ().
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Example
Problem 2 (Slope-Intercept Form): A line has a y-intercept of and a slope of . Find its equation in general form.
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Problem 3 (Two-Point Form): Determine the equation of the line passing through and .
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Example
Problem 4 (Intercept Form): A line has an x-intercept of and a y-intercept of . What is its equation?
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Normal Form
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Problem 1: The perpendicular distance from the origin to a line is units, and the angle this perpendicular makes with the positive x-axis is . Find the equation of the line.
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Example
Problem 2: Convert the general equation into normal form and find the distance to the origin.
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Example
Problem 3: Write the equation in normal form. What is the angle of the normal?
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Family of Lines
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Case Study 1: Analyze the family of lines given by the equation . Prove that all lines in this family pass through a single fixed point, regardless of the value of , and find that point.
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Example
Case Study 2: A civil engineer is designing a series of perfectly parallel drainage pipes. The master blueprint line is given by . Express the mathematical family representing all possible parallel pipes, and determine the specific pipe equation that passes exactly through the survey point .
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Parallel and Perpendicular Lines
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Problem 1: Find the equation of a line passing through that is parallel to the line .
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Problem 2: Determine the equation of the line passing through that is strictly perpendicular to .
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Problem 3: Are the lines and parallel, perpendicular, or neither?
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Distance from a Point to a Line
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Problem 1: Calculate the precise perpendicular distance from the point to the line .
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Problem 2: Find the altitude of a triangle drawn from vertex to the side formed by the line passing through and .
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Distance Between Parallel Lines
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Problem 1: Calculate the exact distance separating the two parallel lines and .
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Problem 2: Find the separation distance between the parallel lines and .
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Angle Between Two Lines
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Problem 1: Find the acute angle between the intersecting lines and .
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Example
Problem 2: What is the angle between the lines and ?
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