Parallel and Perpendicular Slopes

Slopes of parallel lines are...

• opposite reciprocals.

• opposites.

• equal.

• always 7.

Slopes of perpendicular lines are...

• opposite reciprocals.
• opposites.
• the same.
• always 7.

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

• Parallel
• Perpendicular
• Neither
• The same line

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

• Parallel
• Perpendicular
• Neither

y = ¹/₃x + 2

y = 3x + 9

These lines are...

• Parallel

• Perpendicular

• Neither

Which line is perpendicular to
y = 2x - 7  ?

• y = -2x + 8
• y = ¹/₂x - 7 
• y = ^-1/₂x + 2
• y = 2x - 3 

Which line is perpendicular to
y =  x + 9  ?

• y = - x + 8
• y = ¹/₂x + 9 
• y = ^-1/₂x + 9
• y = x - 9 

Which line is parallel to
y = 2x - 7  ?

• y = -2x + 8
• y = ¹/₂x - 7 
• y = ^-1/₂x + 2
• y = 2x - 3 

What slope is parallel to:  
m = ³/₄

• ⁴/₃
• ³/₄
• ^-3/₄
• ^-4/₃

What is the slope of a line perpendicular to a line with slope ^-6/₅ ?

• ^-6/₅
• ^-5/6
• ⁵/₆
• ^-4/₃