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Parallel and Perpendicular 2

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Parallel and Perpendicular Lines
Parallel Lines ,[object Object],[object Object],[object Object]
Testing if Lines are Parallel Are the lines parallel? Find the slope of The slope m = -4 Find the slope of The slope m = -4 Since the slopes are equal the lines are parallel.
Graphs of Parallel Lines The red line is the graph of y = – 4 x – 3 and the blue line is the graph of y = – 4 x – 7
Practice Testing if Lines are Parallel Are the lines parallel? (click mouse for answer) Since the slopes are different the lines are not parallel. Are the lines parallel? (click mouse for answer) Since the slopes are equal the lines are parallel.
Constructing Parallel Lines Find the equation of a line going through the point (3, -5) and parallel to Using the point-slope equation where the slope m = - 2 / 3 and the point is (3, -5) we get
Practice Constructing Parallel Lines Find the equation of the line going through the point (4,1) and parallel to (click mouse for answer) Find the equation of the line going through the point (-2,7) and parallel to (click mouse for answer)
Perpendicular Lines ,[object Object],[object Object],[object Object],[object Object],[object Object]
Testing if Lines Are Perpendicular Since the slopes are negative reciprocals of each other the lines are perpendicular.
Graphs of Perpendicular Lines The red line is the graph of y = – 2 x + 5 and the blue line is the graph of y = – 1 / 2 x +4
Practice Testing if Lines Are Perpendicular Since the slopes are not negative reciprocals of each other (their product is not -1) the lines are not perpendicular Since the slopes are negative reciprocals of each other (their product is -1) the lines are perpendicular.
Constructing Perpendicular Lines Find the equation of a line going through the point (3, -5) and perpendicular to The slope of the perpendicular line will be m = 3 / 2 Using the point-slope equation where the slope m = 3 / 2 and the point is (3, -5) we get
Practice Constructing Perpendicular Lines Find the equation of the line going through the point (4,1) and perpendicular to (click mouse for answer) Find the equation of the line going through the point (-2,7) and perpendicular to (click mouse for answer)

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Parallel and Perpendicular 2

  • 2.
  • 3. Testing if Lines are Parallel Are the lines parallel? Find the slope of The slope m = -4 Find the slope of The slope m = -4 Since the slopes are equal the lines are parallel.
  • 4. Graphs of Parallel Lines The red line is the graph of y = – 4 x – 3 and the blue line is the graph of y = – 4 x – 7
  • 5. Practice Testing if Lines are Parallel Are the lines parallel? (click mouse for answer) Since the slopes are different the lines are not parallel. Are the lines parallel? (click mouse for answer) Since the slopes are equal the lines are parallel.
  • 6. Constructing Parallel Lines Find the equation of a line going through the point (3, -5) and parallel to Using the point-slope equation where the slope m = - 2 / 3 and the point is (3, -5) we get
  • 7. Practice Constructing Parallel Lines Find the equation of the line going through the point (4,1) and parallel to (click mouse for answer) Find the equation of the line going through the point (-2,7) and parallel to (click mouse for answer)
  • 8.
  • 9. Testing if Lines Are Perpendicular Since the slopes are negative reciprocals of each other the lines are perpendicular.
  • 10. Graphs of Perpendicular Lines The red line is the graph of y = – 2 x + 5 and the blue line is the graph of y = – 1 / 2 x +4
  • 11. Practice Testing if Lines Are Perpendicular Since the slopes are not negative reciprocals of each other (their product is not -1) the lines are not perpendicular Since the slopes are negative reciprocals of each other (their product is -1) the lines are perpendicular.
  • 12. Constructing Perpendicular Lines Find the equation of a line going through the point (3, -5) and perpendicular to The slope of the perpendicular line will be m = 3 / 2 Using the point-slope equation where the slope m = 3 / 2 and the point is (3, -5) we get
  • 13. Practice Constructing Perpendicular Lines Find the equation of the line going through the point (4,1) and perpendicular to (click mouse for answer) Find the equation of the line going through the point (-2,7) and perpendicular to (click mouse for answer)