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4.7 Parallel and Perpendicular Lines

4.7 Parallel and Perpendicular Lines. 11/1/2011 Algebra ½ Objective: Write an equation of a line that passes through a given point that is parallel or perpendicular to a given line. Vocab. Parallel Lines: lines that ______ ______. They have the ______ slopes.

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4.7 Parallel and Perpendicular Lines

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  1. 4.7 Parallel and Perpendicular Lines 11/1/2011 Algebra ½ Objective: Write an equation of a line that passes through a given point that is parallel or perpendicular to a given line.

  2. Vocab • Parallel Lines: lines that ______ ______. They have the ______ slopes. • Perpendicular Lines: lines that make a ______ ______. They have ________ ________ slopes.

  3. Example 1: Write in slope-intercept form. a. A line through (-1,-2) that is parallel to y = -3x – 2 b. A line through (4,-2) that is parallel to x – 2y = – 7

  4. Example 1: Write in slope-intercept form. c. A line through (-1,-2) that is perpendicular to y = -x – 2 d. A line through (4,-2) that is perpendicular to x – 2y = – 7

  5. Example 2: Determine if the two lines are parallel, perpendicular, or neither. • y = 4x – 5 x + 4y = 8 • y = x + 8 x + y = 2 b. y = 5x – 7 -5x + y = 2

  6. Assignment Pg. 240 10-28even

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