7. Parallel and Perpendicular Lines
4.4

8. When two lines are parallel, their slopes are equal.

9. Writing Equations
Write an equation of a line through (6, -1) that is
parallel to the line y = –2x + 5
To write an equation, you need m and b.
When two lines are parallel, their slopes are equal. The slope of the other line is –2. So m = –2.
You are also given a point. (6,-1)

10. Writing Equations
Write an equation of a line through (-12, -3) that is
parallel to the line

11. Writing Equations
Write an equation of a line through (-3, 2) that is
parallel to the line 3x + y = 2

12. When two lines are perpendicular, their slopes are opposite reciprocal.

13. Are the two lines perpendicular?
1) y = 3x and y = -3x -6
2) and
3) and

14. Writing Equations
Write an equation of a line through (6, -1) that is
perpendicular to line y = 3x – 2
To write an equation, you need m and b.
When two lines are perpendicular, their slopes are opposite reciprocal.
The slope of the other line is 3. So m =
You are also given a point.

15. Writing Equations
Write an equation of a line through (6, -10) that is
perpendicular to line y = -2x – 5

16. Writing Equations
Write an equation of a line through (-10, -2) that is
perpendicular to line 5x - y = 6

17. ASSIGNMENT
Page even

18. End of the Lesson