Parallel and Perpendicular Lines

Slopes of parallel lines are...

• negative reciprocals.

• opposites.
• the same.
• always 1.

Slopes of perpendicular lines are...

• negative reciprocals.

• opposites.
• the same.
• always 1.

y = -2/3x + 2
y = 3/2x + 9
These lines are...

• Parallel
• Perpendicular
• Neither

What slope is perpendicular to:  
m = 5/8

• -5/8
• 5/8
• -8/5
• 8/5

y = 6x + 2
y = -6x + 2
These lines are...

• Parallel
• Perpendicular
• Neither

Write the equation of the line PARALLEL to the line y = 4x - 9 that passes through the point (-2, 4)

• y = 4x + 12

• y = -4x -4

• y = -1/4x + 5/2

Line 1: (15, 20), (17, 18)

Line 2: (-22, -18), (-20, -16)

The two lines are _____________________.

• Parallel

• Perpendicular

• Neither

y = 3x +2
y = 3x - 3
These lines are...

• Parallel
• Perpendicular
• Neither
• The same line

Match the following

• Intersecting lines

• 
• Parallel lines

• 
• Perpendicular lines

• 

Match the following opposite reciprocal

• -4/5

• 15/4

• 5/7

• -2/3

• -4/15

• 5/4

• 3/2

• -7/5