Determine If Lines Are Parallel or Perpendicular From Their Slopes

Perpendicular lines have the same slope.

• True
• False

The slope of perpendicular lines are negative reciprocals

• True
• False

The following two numbers are negative reciprocals of each other
2 and -1/2

• True
• False
  

Find the slope of a line parallel to the line below.
y = 2x + 4

• 2
• -1/2
• 1/2
• -2

Find the slope of a line perpendicular to the line below.
y = 2x + 4

• 2
• -1/2
• 1/2
• -2

Find the slope of a line parallel to the line below
y = ½x + 4

• 1/2
  
• -1/2
• 2
• -2

Find the slope of a line perpendicular to the line below

y = ½x + 4

• 1/2

• -1/2

• 2

• -2

The following represents slopes of two lines.  Which answer choice describes the two lines?
m = 5 and m = -1/5

• Parallel
• Perpendicular
• Neither

The following represents slopes of two lines.  Which answer choice describes the two lines?
m = -1/3 and m = -1/3

• Parallel
• Perpendicular
• Neither

The following represents slopes of two lines.  Which answer choice describes the two lines?
m = 7 and m = -7

• Parallel
• Perpendicular
• Neither