Parallel and perpendicular lines

1
Parallel and perpendicular lines

• Draw a vertical line
• What is the slope?
• Is it an x line or a y line?

No slope
X
2

• Draw a horizontal line
• What is the slope
• Is it x or y

3

• Draw 2 parallel lines
• What is true of their slopes?

• Draw 2 perpendicular lines
• What is true of their slopes?

4

• What is the slope of a line parallel to a line
  with a slope of 3?
• What is the slope of a line perpendicular to a
  line with a slope of 3?

3
-1/3
5

• Determine whether the graphs are parallel,
  perpendicular or neither

6

• Write an equation of a line through (8, -2)
  and perpendicular to

7
Homework

• Pg 367 19, 20, 26, 28, 34, 36